<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-8123</journal-id>
<journal-title><![CDATA[Revista Colombiana de Reumatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Reumatol.]]></abbrev-journal-title>
<issn>0121-8123</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Reumatología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-81232007000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Reticulohistiocitosis multicéntrica]]></article-title>
<article-title xml:lang="en"><![CDATA[Multicentric reticulohistiocytosis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Restrepo]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez]]></surname>
<given-names><![CDATA[Carlos Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez]]></surname>
<given-names><![CDATA[Mónica Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Eraso]]></surname>
<given-names><![CDATA[Ruth]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Luis Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez]]></surname>
<given-names><![CDATA[Gloria]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uribe]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[Luis Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa]]></surname>
<given-names><![CDATA[Luis Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Hospital Universitario San Vicente de Paúl ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Hospital Universitario San Vicente de Paúl Departamento de Medicina Interna]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Antioquia Hospital Universitario San Vicente de Paúl Sección de Dermatología]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<volume>14</volume>
<numero>3</numero>
<fpage>219</fpage>
<lpage>228</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232007000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232007000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232007000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La reticulohistiocitosis multicéntrica (RHM) es una enfermedad de etiología desconocida que afecta principalmente a mujeres en la cuarta década de la vida. La afección articular se caracteriza por la presencia de sinovitis simétrica de miembros superiores especialmente en manos y afección de piel presentando lesiones de diferente morfología más comúnmente nódulos y pápulas localizadas principalmente en cara y miembros superiores. Puede existir además compromiso de órganos internos como pulmón, corazón, tracto gastrointestinal y glándulas salivales. Esta patología se ha relacionado con la aparición de neoplasias malignas en diferentes órganos como mama, ovario, cérvix y linfomas llegando a ser considerada por diferentes autores como una manifestación de un síndrome paraneoplásico. Los exámenes de laboratorio en estos pacientes evidencian alteraciones en el cuadro hemático, perfil hepático así como marcadores de autoinmunidad. El diagnóstico confirmatorio de la enfermedad se determina por el estudio histológico donde se demuestran células histiocíticas (histiocitos mononucleares) gigantes multinucleadas (con diámetro de 50-100 µm) con citoplasma eosinofílico y gránulos finos con apariencia de vidrio esmerilado. Múltiples medicamentos han sido usados como ciclofosfamida, metotrexate, azatioprina, clorambucil y regímenes conjugados. Se informa el caso de una paciente de sexo femenino de 51 años, raza blanca, que consulta por cuadro clínico de cuatro meses de evolución caracterizado por astenia, adinamia, fiebre subjetiva nocturna, pérdida de peso, poliartritis inflamatoria de carpos, codos y rodillas, así como la aparición de lesiones cutáneas en forma de pápulas dolorosas de color violáceo que se localizaban en cara, codos, manos y flancos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Multicentric reticulohistiocytosis (MRH) is a disease of unknown etiology that affects primarily women in the fourth decade of life. Articular involvement is characterized by the presence of symmetric synovitis of the upper extremities, particularly of the hands, and compromise of the skin with lesions of different morphology, more commonly nodules and papules localized mainly on the face and upper extremities. There can also be involvement of internal organs such as lung, heart, gastrointestinal tract and salivary glands. This disease has been linked to malignant neoplasms of different organs like breast, ovary, uterine cervix and lymphomas, leading some authors to consider this disease a manifestation of a paraneoplastic syndrome. Laboratory testing in these patients show abnormalities of the complete blood count, liver function tests as well as markers of autoimmunity. Histological studies confirm the diagnosis by demonstrating giant multinucleated histiocytic cells (mononuclear histiocytes-diammeter of 50 to 100 µm) with an eosinophilic cytoplasm and fine granules that give the cells a ground glass appearance. Multiple medications have been used to treat this disease including cyclophosphamide, azathioprine, methotrexate, chlorambucil and combined regimens. We document the case of a 51 year old caucasian female patient that was evaluated because of a 4 month history of subjective fever, weakness, fatigue, weight loss, inflammatory bilateral polyarthritis of the wrists, elbows and knees as well as the appearance of painful violaceous papules on the surface of the face, elbows, hands and flanks.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[reticulohistiocitosis multicéntrica]]></kwd>
<kwd lng="es"><![CDATA[enfermedades histiocíticas]]></kwd>
<kwd lng="es"><![CDATA[síndromes paraneoplásicos]]></kwd>
<kwd lng="en"><![CDATA[multicentric reticulohistiocytosis]]></kwd>
<kwd lng="en"><![CDATA[histiocitic diseases]]></kwd>
<kwd lng="en"><![CDATA[paraneoplastic syndrome]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p align="right"><b>Presentaci&oacute;n de caso y Revisi&oacute;n de la Literatura</b></p>     <p>&nbsp;</p>     <P align="center"><font size="4"><b>Reticulohistiocitosis multic&eacute;ntrica</b></font></p>     <p>&nbsp;</p>      <P align="center"><b><font size="3">Multicentric reticulohistiocytosis</font></b></p>     <P align="center">&nbsp;</p>     <p><b>Francisco Vargas<SUP>1</SUP>, Juan Pablo    Restrepo<SUP>1</SUP>, Carlos Jaime    Vel&aacute;squez<SUP>1</SUP>,    M&oacute;nica Patricia    Vel&aacute;squez<SUP>2</SUP>, Ruth    Eraso<SUP>2</SUP>, Luis Alonso    Gonz&aacute;lez<SUP>3</SUP>, Gloria V&aacute;squez<SUP>3</SUP>,    Oscar Uribe<SUP>3</SUP>, Luis Alberto    Ram&iacute;rez<SUP>3</SUP>, Luis Alfonso    Correa<SUP>4</SUP></b></p>      <p>1     Residentes de Reumatolog&iacute;a. Hospital Universitario San Vicente de    Pa&uacute;l, Universidad de Antioquia. Medell&iacute;n. Colombia.    <br>   2 Pediatras reumat&oacute;logas. Profesoras del servicio de reumatolog&iacute;a.    Hospital Universitario San Vicente de Pa&uacute;l, Universidad de Antioquia.    Medell&iacute;n. Colombia.    ]]></body>
<body><![CDATA[<br>   3     Internistas reumat&oacute;logos. Profesores del servicio de reumatolog&iacute;a.    Departamento de Medicina Interna. Hospital Universitario San Vicente de    Pa&uacute;l, Universidad de Antioquia. Medell&iacute;n. Colombia.    <br>   4     Pat&oacute;logo, Profesor Departamento de Patolog&iacute;a. Secci&oacute;n de Dermatolog&iacute;a.    Hospital Universitario San Vicente de Pa&uacute;l, Universidad de    Antioquia. Medell&iacute;n. Colombia.</P>      <p>Recibido para publicaci&oacute;n: julio 25/2007 Aceptado en forma revisada: agosto 31/2007</p>     <p>&nbsp;</p> <hr size="1">     <p><B>Resumen  </B></p>     <p>La reticulohistiocitosis multic&eacute;ntrica (RHM)    es una enfermedad de etiolog&iacute;a desconocida que    afecta principalmente a mujeres en la cuarta    d&eacute;cada de la vida. La afecci&oacute;n articular se caracteriza    por la presencia de sinovitis sim&eacute;trica de    miembros superiores especialmente en manos y afecci&oacute;n    de piel presentando lesiones de diferente    morfolog&iacute;a m&aacute;s com&uacute;nmente n&oacute;dulos y p&aacute;pulas    localizadas principalmente en cara y miembros    superiores. Puede existir adem&aacute;s compromiso de &oacute;rganos    internos como pulm&oacute;n, coraz&oacute;n, tracto    gastrointestinal y gl&aacute;ndulas salivales. Esta patolog&iacute;a    se ha relacionado con la aparici&oacute;n de neoplasias    malignas en diferentes &oacute;rganos como mama,    ovario, c&eacute;rvix y linfomas llegando a ser considerada    por diferentes autores como una manifestaci&oacute;n de    un s&iacute;ndrome paraneopl&aacute;sico. Los ex&aacute;menes de    laboratorio en estos pacientes evidencian    alteraciones en el cuadro hem&aacute;tico, perfil hep&aacute;tico as&iacute;    como marcadores de autoinmunidad. El diagn&oacute;stico    confirmatorio de la enfermedad se determina por el estudio histol&oacute;gico donde se demuestran    c&eacute;lulas histioc&iacute;ticas (histiocitos mononucleares)    gigantes multinucleadas (con di&aacute;metro de 50-100 &#181;m)    con citoplasma eosinof&iacute;lico y gr&aacute;nulos finos con    apariencia de vidrio esmerilado. M&uacute;ltiples    medicamentos han sido usados como ciclofosfamida, metotrexate, azatioprina, clorambucil y    reg&iacute;menes conjugados. Se informa el caso de una paciente    de sexo femenino de 51 a&ntilde;os, raza blanca, que    consulta por cuadro cl&iacute;nico de cuatro meses de    evoluci&oacute;n caracterizado por astenia, adinamia,    fiebre subjetiva nocturna, p&eacute;rdida de peso,    poliartritis inflamatoria de carpos, codos y rodillas, as&iacute;    como la aparici&oacute;n de lesiones cut&aacute;neas en forma    de p&aacute;pulas dolorosas de color viol&aacute;ceo que se  localizaban en cara, codos, manos y flancos.</p>     <p><b>Palabras clave: </b>reticulohistiocitosis multic&eacute;ntrica, enfermedades histioc&iacute;ticas,  s&iacute;ndromes paraneopl&aacute;sicos. <hr size="1">  <b>Summary</b>      <p>Multicentric reticulohistiocytosis (MRH) is a disease of unknown etiology that affects    primarily women in the fourth decade of life.    Articular involvement is characterized by the presence    of symmetric synovitis of the upper extremities,    particularly of the hands, and compromise of the    skin with lesions of different morphology, more    commonly nodules and papules localized mainly on    the face and upper extremities. There can also be    involvement of internal organs such as lung,    heart, gastrointestinal tract and salivary glands. This    disease has been linked to malignant neoplasms of    different organs like breast, ovary, uterine cervix    and lymphomas, leading some authors to consider    this disease a manifestation of a paraneoplastic    syndrome. Laboratory testing in these patients    show abnormalities of the complete blood count,    liver function tests as well as markers of    autoimmunity. Histological studies confirm the diagnosis by    demonstrating giant multinucleated histiocytic    cells (mononuclear histiocytes-diammeter of 50 to    100 &#181;m) with an eosinophilic cytoplasm and fine    granules that give the cells a ground glass    appearance. Multiple medications have been used to treat    this disease including cyclophosphamide,    azathioprine, methotrexate, chlorambucil and combined    regimens. We document the case of a 51 year old caucasian female patient that was evaluated    because of a 4 month history of subjective fever,    weakness, fatigue, weight loss, inflammatory bilateral    polyarthritis of the wrists, elbows and knees as well    as the appearance of painful violaceous papules on  the surface of the face, elbows, hands and flanks. </p>     <p><b>Key words: </b>multicentric reticulohistiocytosis, histiocitic diseases, paraneoplastic syndrome.</p> <hr size="1">      <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b>Introducci&oacute;n</b></font></p>     <p>La reticulohistiocitosis multic&eacute;ntrica (RHM) es  una enfermedad poco com&uacute;n que afecta a mujeres de  edad media, cl&iacute;nicamente caracterizada por s&iacute;ntomas  articulares y cut&aacute;neos. Aunque no se puede considerar  como un s&iacute;ndrome paraneopl&aacute;sico, uno de cada cuatro  casos guarda relaci&oacute;n con la presencia de una  enfermedad maligna. Se reporta el caso de una paciente de  sexo femenino que ingresa a nuestro centro con un  s&iacute;ndrome constitucional asociado a poliartritis inflamatorias.</p>     <p>&nbsp;</p>     <p><B><font size="3">Presentaci&oacute;n del caso</font></B></p>     <p>Una mujer de 51 a&ntilde;os, de raza blanca, es  admitida en nuestro centro hospitalario por cuadro cl&iacute;nico de  cuatro meses de evoluci&oacute;n caracterizado por  astenia, adinamia, fiebre subjetiva nocturna, p&eacute;rdida de peso  no cuantificada, dolor en ambos hemit&oacute;rax y disnea de  esfuerzos. La paciente presentaba adem&aacute;s  poliartritis inflamatoria que se inici&oacute; en rodillas y codos y  posteriormente comprometi&oacute; carpo, tarso y lesiones cut&aacute;neas  en forma de p&aacute;pulas dolorosas de color viol&aacute;ceo que  se localizaban en cara, codos, manos y flancos.</p>     <p>La evaluaci&oacute;n de la paciente revel&oacute; sinovitis de  hombros, mu&ntilde;ecas, codos y rodillas as&iacute; como p&aacute;pulas de  color viol&aacute;ceo en p&aacute;rpados superiores, pabell&oacute;n auricular,  superficies extensoras de codos, articulaciones metacarpofal&aacute;ngicas y articulaciones  interfal&aacute;ngicas distales (<a href="#fig1">Figura 1</a>). </p>     <p align="center"><img src="img/revistas/rcre/v14n3/v14n3a05-1.jpg"><a name="fig1"></a></p>     <p>Los ex&aacute;menes paracl&iacute;nicos evidenciaron un  s&iacute;ndrome an&eacute;mico normoc&iacute;tico normocr&oacute;mico, prueba de Coomb  directo positivo, factor reumatoide negativo,  deshidrogenasa l&aacute;ctica elevada,  hipergammaglobulinemia de tipo policlonal, anticuerpos antinucleares positivos 1:640 patr&oacute;n  nucleolar. En las radiograf&iacute;as de manos se observaron  quistes subcondrales, erosiones en articulaciones  interfal&aacute;ngicas distales con un espacio articular preservado (<a href="#fig2">Figura 2</a>).  El estudio ecocardiogr&aacute;fico demostr&oacute; la presencia de  derrame peric&aacute;rdico e hipertensi&oacute;n pulmonar. El angiotac de  t&oacute;rax report&oacute; im&aacute;genes sugestivas de un  evento tromboemb&oacute;lico pulmonar con afecci&oacute;n de  segmentos pulmonares inferiores y una masa mediastinal anterior.  La biopsia de piel evidenci&oacute; histiocitos y c&eacute;lulas  gigantes multinucleadas (<a href="#fig3">Figura 3</a>) y la biopsia de la lesi&oacute;n  mediastinal confirm&oacute; la presencia de un tumor indiferenciado de  c&eacute;lulas peque&ntilde;as.</p>     <p align="center"><img src="img/revistas/rcre/v14n3/v14n3a05-2.jpg"><a name="fig2"></a></p>     <p align="center"><img src="img/revistas/rcre/v14n3/v14n3a05fig3.jpg"><a name="fig3"></a></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><B><font size="3">Discusi&oacute;n del caso y revisi&oacute;n de la literatura</font></B></p>     <p>La reticulohistiocitosis es un desorden sist&eacute;mico  poco frecuente de etiolog&iacute;a desconocida que se  caracteriza por la presencia de erupciones papulares y nodulares  en piel y mucosas acompa&ntilde;ado de poliartritis erosiva.</p>     <p>Los primeras descripciones de la enfermedad se  remontan a la d&eacute;cada de los 30 (1937) con los reportes  de los doctores Weber y Freudenthal quienes  describieron un caso de xantomatosis con caracter&iacute;sticas  histol&oacute;gicas at&iacute;picas. Sin embargo, no fue hasta 1954 cuando el  t&eacute;rmino de reticulohistiocitosis fue  acu&ntilde;ado por los doctores Golz y Laymon quienes definieron la enfermedad  como &quot;Reticulohistiocitosis multic&eacute;ntrica de la sinovia y de  la piel&quot;<SUP>1,2</SUP>. M&uacute;ltiples sin&oacute;nimos han sido utilizados en la  literatura para designar este s&iacute;ndrome dentro de los  cuales se mencionan histiocitosis de c&eacute;lulas  gigantes, dermatoartritis lipoide y reticulohistiocitosis de c&eacute;lulas  gigantes.</p>     <p>Desde entonces los reportes de la enfermedad  han sido espor&aacute;dicos, describi&eacute;ndose hasta el a&ntilde;o 2004  algo m&aacute;s de 200 casos en la literatura  mundial<SUP>3</SUP>. Si bien la enfermedad tiene una distribuci&oacute;n global, el mayor  n&uacute;mero de casos reportados ha sido en Estados Unidos  y en el Reino Unido.</p>     <p>&nbsp;</p>     <p><B><font size="3">Fisiopatolog&iacute;a</font></B></p>     <p>La RHM hace parte del grupo II de las  histiocitosis no Langerhans, grupo que se caracteriza por la  proliferaci&oacute;n local de los fagocitos. No se ha demostrado  hasta la fecha que exista un componente gen&eacute;tico o  familiar que sea responsable o incremente el riesgo de  desarrollar RHM<SUP>4,5</SUP>. </p>     <p>La etiolog&iacute;a exacta de la RHM no ha sido definida  pero el curso cl&iacute;nico de la enfermedad y sus caracter&iacute;sticas  patol&oacute;gicas sugieren que se trata de un proceso reactivo  de los macr&oacute;fagos ante un factor disparador no conocido  el cual produce un desorden en la funci&oacute;n celular  favoreciendo un estado proinflamatorio<SUP>6</SUP>. Dentro de los  agentes disparadores, las micobacterias han sido propuestas  como factores responsables de la reacci&oacute;n inflamatoria; sin  embargo, y aunque estos pacientes presentan una prueba  de tuberculina positiva, no se ha logrado aislar  micobacterias de las lesiones activas de la  enfermedad<SUP>7</SUP>. Se han sugerido otros agentes disparadores relacionados con trastornos  inmunes como endocrinopat&iacute;as y neoplasias; sin  embargo, no se ha demostrado esta relaci&oacute;n.</p>     <p>Los cambios patol&oacute;gicos caracter&iacute;sticos de la  RHM consisten en activaci&oacute;n no controlada de  macr&oacute;fagos con formaci&oacute;n de granulomas y c&eacute;lulas  gigantes multinucleadas. La sobreactivaci&oacute;n de macr&oacute;fagos  ha sido evidente dada la liberaci&oacute;n de citoquinas que  generar&iacute;an la proliferaci&oacute;n de nuevos macr&oacute;fagos as&iacute;  como la fagocitosis<SUP>8</SUP>. </p>     ]]></body>
<body><![CDATA[<p>Citoquinas como la interleuquina-12,  interleuquina-1&szlig;, interleuquina-6 y el factor de necrosis tumoral (TNF)  generados por macr&oacute;fagos activados ser&iacute;an los  responsables de las erosiones &oacute;seas y cartilaginosas visibles en  pacientes con reticulohistiocitosis<SUP>9</SUP>. </p>     <p>&nbsp;</p>     <p><B><font size="3">Manifestaciones cl&iacute;nicas iniciales y    curso cl&iacute;nico</font></B></p>     <p>La reticulohistiocitosis es una enfermedad no  hereditaria que afecta principalmente a mujeres en la  cuarta d&eacute;cada de la vida con una relaci&oacute;n tres a uno.  Menos frecuentemente la RHM se presenta en los  extremos de la vida<SUP>10,11</SUP>. </p>     <p>La enfermedad es de comienzo insidioso y curso  progresivo. Cuarenta por ciento de los pacientes  debutan con manifestaciones articulares, 30% presenta al  inicio s&iacute;ntomas cut&aacute;neos y un 29% de los pacientes  debuta con una forma mixta presentando manifestaciones  tanto dermatol&oacute;gicas como articulares. El periodo  de latencia entre el inicio de los s&iacute;ntomas articulares y  el cuadro cut&aacute;neo es variable pudiendo ser de meses  a a&ntilde;os<SUP>4</SUP>. </p>     <p>Otra forma menos frecuente de inicio de la  enfermedad incluye manifestaciones esof&aacute;gicas tipo  disfagia y odinofagia secundaria a la presencia de n&oacute;dulos en  el territorio orofar&iacute;ngeo.</p>     <p>Luego del inicio de la sintomatolog&iacute;a, el curso  cl&iacute;nico de la RHM es caracterizado por periodos de  remisi&oacute;n con periodos de exacerbaci&oacute;n, pudi&eacute;ndose presentar  resoluci&oacute;n espont&aacute;nea de los s&iacute;ntomas en un periodo  de siete a&ntilde;os luego del inicio de la sintomatolog&iacute;a; sin  embargo, son comunes las secuelas principalmente de  &iacute;ndole articular (11% al 45% de los pacientes) a pesar de  la mejor&iacute;a sintom&aacute;tica<SUP>4,  12</SUP> (<a href="#tab1">Tabla 1</a>). </p>     <p align="center"><img src="img/revistas/rcre/v14n3/v14n3a05tab1.jpg"><a name="tab1"></a></p>     <p><B><font size="3">Compromiso articular</font></B></p>     <p>El compromiso articular tiende a ser progresivo,  de caracter&iacute;sticas inflamatorias, presentando edema de  la articulaci&oacute;n y dolor de moderada intensidad. El inicio  de la enfermedad es caracterizado por un compromiso  articular sim&eacute;trico, que afecta principalmente las  articulaciones interfal&aacute;ngicas de manos. En orden de  frecuencia las articulaciones m&aacute;s afectadas son las peque&ntilde;as  de manos (75%), rodillas (65%), mu&ntilde;ecas (46%),  codos (36%), tobillos y caderas (9%), pies (6%), cuello y  columna (2%)<SUP>4,13</SUP>. La afecci&oacute;n articular es m&aacute;s severa  los primeros a&ntilde;os de la enfermedad disminuyendo su  agresividad luego de un periodo de ocho a diez a&ntilde;os  despu&eacute;s del inicio de los  s&iacute;ntomas<SUP>14</SUP>. </p>     ]]></body>
<body><![CDATA[<p>El curso cl&iacute;nico de la enfermedad articular es  variable. La mitad de los pacientes puede tener un curso  cl&iacute;nico severo caracterizado por una r&aacute;pida evoluci&oacute;n  a artropat&iacute;a erosiva severa y a una artropat&iacute;a  mutilante generando secuelas de dedos en catalejo o  &quot;acorde&oacute;n&quot;<SUP>4</SUP>. Otro grupo de pacientes pueden tener un curso  m&aacute;s benigno con mejor&iacute;a espont&aacute;nea del cuadro articular  luego de dos a cinco a&ntilde;os del inicio de los  s&iacute;ntomas<SUP>15</SUP>. </p>     <p>Si bien algunas im&aacute;genes en la RHM no  permiten diferenciar esta patolog&iacute;a de otras enfermedades  que cursen con artropat&iacute;a inflamatoria, ciertas  caracter&iacute;sticas sugieren este  diagn&oacute;stico<SUP>13,16</SUP>. Los estudios de  im&aacute;genes se caracterizan por compromiso articular  erosivo que generan ampliaci&oacute;n del espacio articular,  p&eacute;rdida del cart&iacute;lago articular y resorci&oacute;n del hueso  subcondral. Las &aacute;reas m&aacute;s frecuentemente comprometidas en  los estudios radiogr&aacute;ficos son en el 75% de los  pacientes las articulaciones interfal&aacute;ngicas (principalmente  las distales). Otras articulaciones como la mu&ntilde;eca,  columna cervical, compromiso sacroil&iacute;aco y  costovertebral pueden presentar cambios  erosivos<SUP>17</SUP>. No es com&uacute;n la presencia de osteopenia yuxtaarticular o de  neoformaci&oacute;n &oacute;sea.</p>     <p>&nbsp;</p>     <p><B><font size="3">Manifestaciones dermatol&oacute;gicas</font></B></p>     <p>La afecci&oacute;n de piel se caracteriza por lesiones  en forma de n&oacute;dulos y p&aacute;pulas localizadas m&aacute;s  com&uacute;nmente en cara y manos. </p>     <p>Las lesiones nodulares son variables en tama&ntilde;o,  de pocos mil&iacute;metros hasta dos cent&iacute;metros; variables  en n&uacute;mero, desde pocas lesiones hasta lesiones m&uacute;ltiples  y caracterizadas por tener una distribuci&oacute;n  c&eacute;falo-caudal, disminuyendo el n&uacute;mero en la parte inferior del tronco  y en las extremidades inferiores. En la regi&oacute;n de las  manos, las lesiones nodulares se ubican en el dorso,  borde lateral de los dedos y pueden tomar forma de  peque&ntilde;as tumefacciones alrededor del borde ungueal lo cual  es caracter&iacute;stico de esta enfermedad. En el cr&aacute;neo, las  lesiones se localizan primordialmente en orejas, puente  de la nariz y regi&oacute;n del occipucio. Las lesiones pueden  confluir formando placas y generando fascies  leonina<SUP>12, 18</SUP>. El caso reportado presentaba lesiones que  t&iacute;picamente se han descrito en pacientes con RHM seg&uacute;n  diferentes series como las lesiones nodulares viol&aacute;ceas o  las lesiones en collar de perlas periungueales. </p>     <p>Se han descrito otras manifestaciones cut&aacute;neas  como son: </p>     <p>&#183;     Lesiones ulcerosas<SUP>19, 20</SUP>.</p>     <p>&#183;     Placas hipocr&oacute;micas localizadas en cara  y brazos<SUP>21</SUP>. </p>     <p>&#183;     Lesiones tipo telangiectasias &uacute;nicas o  asociadas a los n&oacute;dulos t&iacute;picos de la enfermedad o  menos com&uacute;n n&oacute;dulos  sangrantes<SUP>22</SUP>. </p>     ]]></body>
<body><![CDATA[<p>&#183;     Eritrodermia y fen&oacute;meno de  K&ouml;ebner<SUP>23, 24</SUP>.</p>     <p>Una tercera parte de los pacientes pueden tener  lesiones en mucosas afectando la cavidad oral y  nasal. Mucho menos frecuentes son lesiones en el &aacute;rea  genital y perianal<SUP>25, 26</SUP>. </p>     <p>Las lesiones antes descritas, pueden remitir  espont&aacute;neamente o hacerlo en respuesta al tratamiento. </p>     <p>&nbsp;</p>     <p><B><font size="3">Otras manifestaciones cl&iacute;nicas</font></B></p>     <p>La RHM debe de ser considerada una enfermedad sist&eacute;mica en la cual cualquier territorio de la  anatom&iacute;a corporal puede estar comprometido. </p>     <p>S&iacute;ntomas constitucionales han sido reportados en  diferentes series: p&eacute;rdida de peso (15%), debilidad  (10%), s&iacute;ntomas cardiovasculares (9%), mialgias (6%),  fiebre (5%), anorexia (4%), disfagia (3%) y  linfadenopat&iacute;as (3%). La presencia de dislipidemia y tuberculina  positiva se ha reportado en el 30-58% y 12-50% de los  casos, respectivamente<SUP>27-29</SUP>. </p>     <p>Existen reportes de compromiso pulmonar,  cardiaco, tracto gastrointestinal y gl&aacute;ndulas  salivales<SUP>9, 29, 30</SUP>. El compromiso pulmonar tiende a ser bilateral y sim&eacute;trico,  presentando lesiones nodulares con lesiones intersticiales. Tambi&eacute;n se  ha descrito la presencia de derrame pleural, fibrosis pulmonar  y adenopat&iacute;as hiliares<SUP>27</SUP>.</p>     <p>Existen pocos reportes de RHM durante la gestaci&oacute;n. Se ha descrito la presencia de proteinuria  y preeclampsia en las pacientes con RHM sugiriendo  una relaci&oacute;n causal clara entre la RHM y los  trastornos hipertensivos del embarazo. Puede existir relaci&oacute;n  entre el grado de actividad articular en la RHM y la  severidad del compromiso  obst&eacute;trico<SUP>31-33</SUP>. </p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><B><font size="3">Reticulohistiocitosis como enfermedad paraneopl&aacute;sica</font></B></p>     <p>Desde 1969 Barrow sugiri&oacute; la asociaci&oacute;n entre  RHM y malignidad<SUP>4</SUP><B>. </B>El primer reporte en 33 pacientes  con RHM document&oacute; cinco casos de c&aacute;ncer. Luego de  estas primeras descripciones, reportes m&aacute;s recientes  han encontrado asociaciones variables entre un 24% y  un 31%<SUP>8, 34, 35</SUP>. </p>     <p>En la mayor&iacute;a de los reportes el diagn&oacute;stico  entre malignidad y RHM ocurre transcurridos al menos  dos a&ntilde;os de la enfermedad histioc&iacute;tica; sin embargo, el  tiempo entre el inicio de la RHM y el diagn&oacute;stico de  c&aacute;ncer puede ser de meses o presentarse simult&aacute;neamente  las dos enfermedades como ocurre en este  caso<SUP>36</SUP>.</p>     <p>No hay un tipo histol&oacute;gico de c&aacute;ncer que sea  predominante en pacientes con RHM y diferentes tipos de  neoplasias han sido descritas en pacientes con RHM dentro de  las cuales se mencionan mama, ovario, cervix,  mesoteliomas, linfomas, melanomas, carcinomas de pene y  est&oacute;mago<SUP>37, 38</SUP>. En el caso que se reporta, se confirm&oacute; la presencia  de un linfoma a nivel mediastinal lo cual ya ha sido  reportado por otros autores<SUP>39</SUP>. </p>     <p>Se ha descrito que la resoluci&oacute;n del  proceso neopl&aacute;sico se acompa&ntilde;a de la desaparici&oacute;n de los  s&iacute;ntomas de RHM<SUP>40</SUP>. </p>     <p>&nbsp;</p>     <p><B><font size="3">Estudios de patolog&iacute;a</font> </B></p>     <p>El diagn&oacute;stico de la RHM se basa en el  hallazgo histopatol&oacute;gico de muestras obtenidas tanto de  lesiones en piel como de tejido sinovial. </p>     <p>En estudios por microscop&iacute;a de luz en  estadios tempranos de la enfermedad predomina la  infiltraci&oacute;n celular de eosin&oacute;filos, linfocitos, histiocitos con  escaso n&uacute;mero de c&eacute;lulas gigantes. Con la evoluci&oacute;n de la  enfermedad predomina la presencia de c&eacute;lulas  gigantes con menor infiltrado de otros tipos celulares. Las  c&eacute;lulas gigantes, hallazgos caracter&iacute;sticos de la  enfermedad, son c&eacute;lulas histioc&iacute;ticas (histiocitos mononucleares)  gigantes multinucleadas de 50-100 &igrave;m de di&aacute;metro con  un citoplasma eosinof&iacute;lico con gr&aacute;nulos finos y  apariencia en vidrio esmerilado. Otras c&eacute;lulas inflamatorias  pueden estar presentes pero en menor n&uacute;mero. Los  estudios de histoqu&iacute;mica practicados a los  espec&iacute;menes reportan infiltraci&oacute;n no espec&iacute;fica de l&iacute;pidos y la  presencia de un componente polisac&aacute;rido en el interior de  los histioc&iacute;tos y de las c&eacute;lulas gigantes. Coloraciones  como Sudan III, Sudan IV, Scharlach R, Nile blue, y oil red  O sugieren un componente de grasas neutras y el  Sudan Negro R sugiere un componente  fosfolip&iacute;dico<SUP>4, 41, 42</SUP>. </p>     <p>Las lesiones sinoviales son histol&oacute;gicamente  similares a las lesiones encontradas en piel; sin embargo, el  n&uacute;mero de c&eacute;lulas gigantes tiende a ser menor.</p>     ]]></body>
<body><![CDATA[<p>La microscop&iacute;a electr&oacute;nica confirma la presencia  de numerosos gr&aacute;nulos electro-densos adyacentes al  aparato de Golgi con coloraciones positivas para  fosfatasa &aacute;cida, formando un halo, el cual representa la  presencia de lisosimas. Vacuolas lip&iacute;dicas son halladas en  los histiocitos representando un proceso degenerativo  en lugar de un sitio de almacenamiento de  l&iacute;pidos<SUP>43, 44</SUP>. </p>     <p>Los estudios con inmunohistoqu&iacute;mica son  positivos para CD4, CD45, CD68, lisosimas, &aacute;1 antitripsina y  extendidos negativos para CD20, S100 y factor XIIa,  aunque existen controversias en estos hallazgos  haciendo complicado determinar el posible origen de estas  c&eacute;lulas gigantes<SUP>41,45- 47</SUP>. </p>     <p>&nbsp;</p>     <p><B><font size="3">Estudios de laboratorio</font></B></p>     <p>No hay una prueba diagn&oacute;stica de la RHM  pero diferentes alteraciones pueden ser encontradas  (<a href="#tab2">Tabla 2</a>). </p>     <p align="center"><img src="img/revistas/rcre/v14n3/v14n3a05tab2.GIF"><a name="tab2"></a></p>     <p>&#183;     Cerca de la mitad de los pacientes presentan  s&iacute;ndrome an&eacute;mico normoc&iacute;tico normocr&oacute;mico  con velocidad de sedimentaci&oacute;n elevada como en  el caso que se reporta.</p>     <p>&#183;     La dislipidemia con hipercolesterolemia est&aacute;  presente en una tercera parte de los casos. </p>     <p>&#183;     Menos frecuente ha sido reportada la  presencia de Factor Reumatoide, anticuerpos  antinucleares e hipergammaglobulinemia.</p>     <p>&#183;     El estudio de l&iacute;quido sinovial realizado a  pacientes con RHM ni tiene caracter&iacute;sticas  espec&iacute;ficas ni uniformes; es as&iacute; como se reportan  recuentos celulares y recuentos diferenciales no uniformes. </p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><B><font size="3">Diagn&oacute;stico diferencial</font></B></p>     <p>El diagn&oacute;stico diferencial de la RHM involucra  m&uacute;ltiples patolog&iacute;as que pueden generar un reto al cl&iacute;nico. </p>     <p>&#183;     La RHM difiere de la artritis reumatoide  (AR) en la carencia de la osteoporosis  yuxta-articular, la presencia de un espacio articular  incrementado y un compromiso de articulaciones  interfal&aacute;ngicas distales (IFD), lo cual no es com&uacute;n en la  AR<SUP>3, 48</SUP>. </p>     <p>&#183;     El compromiso de las articulaciones  interfal&aacute;ngicas distales IFD es com&uacute;n en la  artritis psori&aacute;sica, la cual puede presentar en  ausencia de lesiones cut&aacute;neas. Las erosiones en  psoriasis pueden tambi&eacute;n producir dedos en catalejo  como sucede en pacientes con artritis reumatoide.  Sin embargo, en la artritis psori&aacute;sica la  neoformaci&oacute;n &oacute;sea, la presencia de entesitis, la anquilosis  intra-articular y el compromiso asim&eacute;trico permiten  diferenciar la presencia de RHM<SUP>13,  49</SUP>.</p>     <p>&#183;     La osteoartritis erosiva igualmente puede  comprometer las articulaciones IFD; sin embargo, la presencia de neoformaci&oacute;n &oacute;sea,  osteofitos, es un punto b&aacute;sico en el diagn&oacute;stico  diferencial<SUP>49</SUP>. </p>     <p>&#183;     En la enfermedad articular por cristales de  urato monos&oacute;dico, gota, se asocia igualmente con  compromiso de las articulaciones  interfal&aacute;ngicas distales. Sin embargo, en la gota existe un  compromiso importante de los tejidos blandos periarticulares (tofos), adem&aacute;s el  compromiso generalmente es asim&eacute;trico, respeta el  espacio articular y presenta lesiones en  &quot;overhanging&quot; en los estudios de  radiolog&iacute;a<SUP>50</SUP>.</p>     <p>&#183;     El reumatismo fibrobl&aacute;stico es una  enfermedad poco com&uacute;n que puede simular la RHM por  la presencia de lesiones cut&aacute;neas y  artropat&iacute;a destructiva sim&eacute;trica con cambios erosivos en  los IFD. Sin embargo, la presencia de fen&oacute;meno  de Raynaud y esclerodactilia en el reumatismo fibrobl&aacute;stico as&iacute; como la presencia de  osteoporosis yuxtaarticular son herramientas &uacute;tiles para  diferenciar las dos enfermedades<SUP>51</SUP>. </p>     <p>&#183;     El Xantogranuloma juvenil y los tumores de  c&eacute;lulas gigantes son parte del diagn&oacute;stico  diferencial; sin embargo, estas patolog&iacute;as no cursan  con sinovitis y la inmunohistoqu&iacute;mica de  los xantogranulomas son positivos para factor  XIIIa y los tumores de c&eacute;lulas gigantes son  positivos para la actina del m&uacute;sculo liso (HHF35)  <SUP>52</SUP>. </p>     <p>&#183;     Las lesiones dermatol&oacute;gicas en RHM pueden  simular lesiones por sarcoidosis, lepra  lepromatosa, granuloma anular, xantomas, lipomas,  proteinosis lipoide y enfermedad de Fabre. </p>     ]]></body>
<body><![CDATA[<p>&#183;     Zayid report&oacute; una forma familiar de  dermatoartritis histioc&iacute;tica cuya &uacute;nica diferencia con  la RHM es su forma de presentaci&oacute;n como  enfermedad familiar. Adem&aacute;s esta patolog&iacute;a se  inicia tempranamente en la vida y cursa con una importante lesi&oacute;n  ocular<SUP>53</SUP>. </p>     <p>&#183;     Si bien la polimiositis y la dermatomiositis no  son diagn&oacute;sticos diferenciales comunes, ciertas  caracter&iacute;sticas pueden obligar a considerarlas.  La presencia de telangiectasias periungueales  as&iacute; como las caracter&iacute;sticas de la histolog&iacute;a son  los elementos determinantes en el diagn&oacute;stico y  diferenciaci&oacute;n de estas dos  enfermedades<SUP>54-56</SUP>. </p>     <p>&nbsp;</p>     <p><B><font size="3">Tratamiento</font></B></p>     <p>Existen autores que sugieren que la  intervenci&oacute;n farmacol&oacute;gica en la RHM no cambia el curso cl&iacute;nico  de la enfermedad<SUP>57</SUP>. Sin embargo, el da&ntilde;o articular  generado en la RHM puede ser tan severo como el  observado en pacientes con artritis reumatoide y la dermatitis  puede generar secuelas est&eacute;ticas importantes. Por estas  razones se ha sugerido que la enfermedad debe ser  tratada de una manera agresiva<SUP>58, 59</SUP>. </p>     <p>M&uacute;ltiples medicamentos han sido sugeridos  como posibilidades de intervenci&oacute;n en pacientes con  RHM. Entre otros, ciclofosfamida, metotrexate,  azatioprina, clorambucil y reg&iacute;menes  conjugados<SUP>60</SUP>. </p>     <p>Tratamiento con antiinflamatorios no esteroides  y analg&eacute;sicos pueden ser &uacute;tiles en las formas leves de  la enfermedad<SUP>61</SUP>. </p>     <p>El uso de esteroides como monoterapia en dosis altas (prednisona 1 mg kilo d&iacute;a) o dosis bajas  (menos de 10 mg d&iacute;a) pueden tener un papel paliativo en  los s&iacute;ntomas articulares pero no son &uacute;tiles en inducir  remisi&oacute;n de la enfermedad. La adici&oacute;n de  antimal&aacute;ricos puede tener buenos  resultados<SUP>62</SUP>. </p>     <p>El uso de metotrexate (7,5 mg a 25 mg semanales) ha evidenciado buenos resultados en relaci&oacute;n  a mejor&iacute;a de los s&iacute;ntomas y el tama&ntilde;o de las  lesiones nodulares adem&aacute;s de mejorar la sinovitis. En el  estudio de Gourmelen, metotrexate a dosis de 7,5-10  mg evidenci&oacute; resoluci&oacute;n del cuadro en 34 meses de  tratamiento en una paciente de 64 a&ntilde;os con  RHM<SUP>59, 60</SUP>. </p>     <p>Ciclofosfamida oral (200 mg/d&iacute;a), clorambucil  (0,1 mg/kilo/d&iacute;a) y ciclosporina han evidenciado  resultados similares al metotrexate en t&eacute;rminos de mejor&iacute;a de  la sinovitis y efecto sobre el tama&ntilde;o de los n&oacute;dulos  cut&aacute;neos<SUP>60, 63, 64</SUP>.</p>     ]]></body>
<body><![CDATA[<p>Nuevas alternativas como los bloqueadores del  factor de necrosis tumoral se presentan como  opciones de tratamiento para pacientes con diagn&oacute;stico de  RHM que han sido refractarios a metotrexate y  esteroides<SUP>65</SUP>. En la actualidad existen informes de pacientes  con RHM refractarios a tratamiento con metotrexate  en los que se ha logrado resoluci&oacute;n de los s&iacute;ntomas  articulares con el uso de etanercept a dosis de 25 mg  subcut&aacute;neo dos veces por semana (66-68). El  infliximab, otro inhibidor del factor de necrosis tumoral,  tambi&eacute;n ha sido utilizado en dosis de 3 mg/kg/dosis hasta 5  mg en combinaci&oacute;n con metotrexate y azatioprina en  pacientes refractarios, documentando una respuesta  adecuada de las manifestaciones cut&aacute;neas pero con  poco efecto sobre las manifestaciones  articulares<SUP>70</SUP>. </p>     <p>Existen informes del uso de bifosfonatos, espec&iacute;ficamente el &aacute;cido zolendr&oacute;nico y  alendronato, en pacientes con RHM con resultados satisfactorios.  Los posibles mecanismos de acci&oacute;n de los  bifosfonatos podr&iacute;an estar en relaci&oacute;n con su capacidad de  inhibir la infiltraci&oacute;n de histioc&iacute;tos  (monocitos y macr&oacute;fagos) favoreciendo su apoptosis adem&aacute;s de disminuir la  producci&oacute;n de metaloproteinasas de matriz en las  lesiones de pacientes con RHM. El alendronato ha  evidenciado ser efectivo para el manejo de las  manifestaciones articulares y cut&aacute;neas de la  enfermedad<SUP>71-75</SUP>.</p>     <p>&nbsp;</p>     <p align="center"><B><font size="3">Conclusi&oacute;n</font> </B></p>     <p>La reticulohistiocitosis es una enfermedad  sist&eacute;mica poco frecuente, de etiolog&iacute;a a&uacute;n no conocida y que  se caracteriza por compromiso de m&uacute;ltiples &oacute;rganos  pudiendo generar artropat&iacute;a erosiva y aun mutilante  as&iacute; como lesiones cut&aacute;neas que pueden generar  secuelas est&eacute;ticas importantes. Se ha clasificado como una  enfermedad paraneopl&aacute;sica dada una asociaci&oacute;n  importante con la presencia de malignidad. El tratamiento  de la enfermedad debe ser iniciado tempranamente con  el fin de evitar secuelas irreversibles en los pacientes.  En la actualidad, drogas como metotrexate y  ciclofosfamida son las que presentan mejor evidencia considerando  tasas de respuesta. </p>     <p>&nbsp;</p>     <p align="center"><B><font size="3">Referencias</font></B></p>     <!-- ref --><p>1.     Weber FP, Freudenthal W. Nodular non-diabetic  cutaneous xanthomatosis with hypercholesterolemia and  atypical histological features. Proc Royal Society Med 1937;  30: 522-526.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000120&pid=S0121-8123200700030000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2.     Goltz RW, Laymon CW. Multicentric  reticulohistiocytosis of the skin and synovia. Reticulohistyocitoma or  ganglioneuroma. Arch Dermatol Syphilol. 1954; 69: 717_73&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000121&pid=S0121-8123200700030000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3.     Trotta F, Castellino G, Lo Monaco. Multicentric  reticulohistiocytosis. Best Pract Res Clin Rheumatol 2004;  18: 759-772.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000122&pid=S0121-8123200700030000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>4.     Barrow MV, Holubar K. Multicentric  reticulohistiocytosis. A review of 33 patients. Medicine (Baltimore) 1969;  48: 287-305. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000123&pid=S0121-8123200700030000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>5.     Chevrant-Breton J, Bourel M, Ferrand B.  Multicentric reticulohistiocytosis; a case report. Ann Dermatol  Venereol 1977; 104: 755 -759.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000124&pid=S0121-8123200700030000500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>6.     Snow JL, Su WPD. Histiocytic diseases. J Am  Acad Academy Dermatol 1995; 33: 111-116. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000125&pid=S0121-8123200700030000500006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>7.     Aseev DD, Tonitrova NS, Amiantova IS, Makarova  SA, Kireeva SG. Diagnosis of reticulohistiocytosis in  adults treated at a tuberculosis clinic Probl Tuberk 1974; 2:  39-43.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000126&pid=S0121-8123200700030000500007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>8.     Catterall MD. Multicentric reticulohistiocytosis: a  review of eight cases. 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A case of multicentric reticulohistiocytosis in a  6-year-old child. J Rheumatol 1998; 25: 794-797.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000129&pid=S0121-8123200700030000500010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>11.     Outland JD, Keiran SJ, Schikler KN, Callen JP.  Multicentric reticulohistiocytosis in a 14-year-old girl. Pediatr  Dermatol 2002; 19: 527-531. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000130&pid=S0121-8123200700030000500011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>12.     Rios Blanco JJ, Barbado Hernandez FJ, Gomez Cerezo  J. Multicentric reticulohistiocytosis. The long course of a  rare disease. Scand J Rheumatol 2002; 31: 107-109.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000131&pid=S0121-8123200700030000500012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>13.     Santilli D, Lo Monaco A, Cavazzini PL, Trotta  F. Multicentric reticulohistiocytosis: a rare cause of  erosive arthropathy of the distal interphalangeal finger joints.  Ann Rheum Dis 2002; 61: 485-487.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000132&pid=S0121-8123200700030000500013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>14.     Lesher Jr JL, Allen BS. Multicentric  reticulohistiocytosis. 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