<?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>2011-7582</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cirugía]]></journal-title>
<abbrev-journal-title><![CDATA[rev. colomb. cir.]]></abbrev-journal-title>
<issn>2011-7582</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Cirugía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2011-75822008000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Neoplasia papilar intraductal mucinosa de páncreas]]></article-title>
<article-title xml:lang="en"><![CDATA[Intraductal papillary mucinous carcinoma of the pancreas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno]]></surname>
<given-names><![CDATA[Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[María Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez]]></surname>
<given-names><![CDATA[Íngrid]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario Departamental de Nariño Departamento Quirúrgico ]]></institution>
<addr-line><![CDATA[Pasto ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario Departamental de Nariño  ]]></institution>
<addr-line><![CDATA[Pasto ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Universitario Departamental de Nariño Servicio de Patología ]]></institution>
<addr-line><![CDATA[Pasto ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Hospital Universitario Departamental de Nariño Médica interna ]]></institution>
<addr-line><![CDATA[Pasto ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2008</year>
</pub-date>
<volume>23</volume>
<numero>3</numero>
<fpage>174</fpage>
<lpage>180</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S2011-75822008000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S2011-75822008000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S2011-75822008000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La neoplasia papilar intraductal de páncreas es una entidad poco frecuente, raramente invasiva, de bajo potencial de malignización, de presentación poco típica y, generalmente, asintomática, que afecta la cola o el cuerpo pancreático y en muchas oportunidades es un hallazgo incidental en estudios de imágenes, como la ecografía abdominal y la tomografía. El estudio de la lesión puede realizarse de diferentes maneras, como la tomografía o la colangiografía endoscópica para estudio imaginológico y la aspiración del líquido pancreático para el estudio citológico y de marcadores tumorales. La ultrasonografía endoscópica y la colangiorresonancia permiten obtener datos más aproximados para el diagnóstico de esta lesión y para la definición del manejo, el cual en la mayoría de los casos consiste en la realización de resección quirúrgica con biopsia intraoperatoria por congelación. Se presenta el caso de un paciente con cáncer papilar intraductal de páncreas y se hace una revisión sobre este tema.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The intraductal papillary mucinous carcinoma of the pancreas is an infrequent entity, rarely invasive, of low potential of malignancy, atypical in its presentation, and generally asymptomatic. It affects the body or tail of the pancreas, and in many cases is an incidental finding in diagnostic imaging, such as abdominal ultrasonophy or CT scanning. The lesion can be studied by different means, such as CT scanning or endoscopic ultrasonography intended to obtain images and pancreatic juice for cytology and tumor markers. Endoscopic ultrasonography and cholangiography by magnetic resonance provide information for the diagnosis of this lesion and for its management, which generally involves surgical resection with intaoperative biopsy by frozen section. We present one case of intraductal papillary mucinous carcinoma of the together with a literature review.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[neoplasias pancreáticas]]></kwd>
<kwd lng="es"><![CDATA[papilloma]]></kwd>
<kwd lng="es"><![CDATA[intraductal]]></kwd>
<kwd lng="es"><![CDATA[carcinoma papilar]]></kwd>
<kwd lng="es"><![CDATA[cistadenoma mucinoso]]></kwd>
<kwd lng="es"><![CDATA[diagnóstico]]></kwd>
<kwd lng="en"><![CDATA[pancreatic neoplasms]]></kwd>
<kwd lng="en"><![CDATA[papiloma intraductal]]></kwd>
<kwd lng="en"><![CDATA[carcinoma papillary]]></kwd>
<kwd lng="en"><![CDATA[cystadenoma]]></kwd>
<kwd lng="en"><![CDATA[mucinous]]></kwd>
<kwd lng="en"><![CDATA[diagnosis]]></kwd>
<kwd lng="en"><![CDATA[pancreatectomy]]></kwd>
<kwd lng="en"><![CDATA[pancreatectomía]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">      <p>        <center>     <font size="4"><b>Neoplasia papilar intraductal mucinosa de p&aacute;ncreas</b></font>    </center> </p>     <p>        <center>     <font size="3"><b>Intraductal papillary mucinous carcinoma of the pancreas</b></font>    </center> </p>     <p>        <center>     H&eacute;ctor L&oacute;pez, MD.<sup>(1)</sup>, Emilio Moreno, MD.<sup>(2)</sup>,      Mar&iacute;a Teresa Garc&iacute;a, MD<font size="2" face="Verdana">.</font><sup>(3)</sup>,      &Iacute;ngrid &Aacute;lvarez, MD.<sup>(4)</sup>    </center> </p>     <p><sup>(1)</sup>Jefe, Departamento Quir&uacute;rgico, Hospital Universitario    Departamental de Nari&ntilde;o, Pasto, Colombia.    <br>   <sup>(2)</sup>Cirujano, Hospital Universitario Departamental de Nari&ntilde;o,    Pasto, Colombia.    <br>   <sup>(3)</sup>Coordinadora, Servicio de Patolog&iacute;a, Hospital Universitario    Departamental de Nari&ntilde;o, Pasto, Colombia.    ]]></body>
<body><![CDATA[<br>   <sup>(4)</sup>M&eacute;dica interna, Hospital Universitario Departamental de    Nari&ntilde;o, Pasto, Colombia.</p>     <p><b>Correspondencia</b>: H&eacute;ctor L&oacute;pez, MD. Correo electr&oacute;nico:    <a href="mailto:hlopezmoncayo@yahoo.com">hlopezmoncayo@yahoo.com</a>. Pasto,    Colombia</p>     <p>Fecha de recibo: 18 de junio de 2008. Fecha de aprobaci&oacute;n: 18 de julio    de 2008.</p> <hr size=1>     <p><font size="3"><b>Resumen</b></font></p>     <p>La neoplasia papilar intraductal de p&aacute;ncreas es una entidad poco frecuente,    raramente invasiva, de bajo potencial de malignizaci&oacute;n, de presentaci&oacute;n    poco t&iacute;pica y, generalmente, asintom&aacute;tica, que afecta la cola    o el cuerpo pancre&aacute;tico y en muchas oportunidades es un hallazgo incidental    en estudios de im&aacute;genes, como la ecograf&iacute;a abdominal y la tomograf&iacute;a.</p>     <p>El estudio de la lesi&oacute;n puede realizarse de diferentes maneras, como    la tomograf&iacute;a o la colangiograf&iacute;a endosc&oacute;pica para estudio    imaginol&oacute;gico y la aspiraci&oacute;n del l&iacute;quido pancre&aacute;tico    para el estudio citol&oacute;gico y de marcadores tumorales. La ultrasonograf&iacute;a    endosc&oacute;pica y la colangiorresonancia permiten obtener datos m&aacute;s    aproximados para el diagn&oacute;stico de esta lesi&oacute;n y para la definici&oacute;n    del manejo, el cual en la mayor&iacute;a de los casos consiste en la realizaci&oacute;n    de resecci&oacute;n quir&uacute;rgica con biopsia intraoperatoria por congelaci&oacute;n.</p>     <p>Se presenta el caso de un paciente con c&aacute;ncer papilar intraductal de    p&aacute;ncreas y se hace una revisi&oacute;n sobre este tema.</p>     <p>Palabras clave: neoplasias pancre&aacute;ticas, papilloma, intraductal, carcinoma    papilar, cistadenoma mucinoso, diagn&oacute;stico.</p> <hr size=1>     <p><font size="3"><b>Abstract</b></font></p>     <p>The intraductal papillary mucinous carcinoma of the pancreas is an infrequent    entity, rarely invasive, of low potential of malignancy, atypical in its presentation,    and generally asymptomatic. It affects the body or tail of the pancreas, and    in many cases is an incidental finding in diagnostic imaging, such as abdominal    ultrasonophy or CT scanning.</p>     ]]></body>
<body><![CDATA[<p>The lesion can be studied by different means, such as CT scanning or endoscopic    ultrasonography intended to obtain images and pancreatic juice for cytology    and tumor markers. Endoscopic ultrasonography and cholangiography by magnetic    resonance provide information for the diagnosis of this lesion and for its management,    which generally involves surgical resection with intaoperative biopsy by frozen    section.</p>     <p>We present one case of intraductal papillary mucinous carcinoma of the together    with a literature review.</p>     <p>Key words: pancreatic neoplasms, papiloma intraductal, carcinoma papillary,    cystadenoma, mucinous, diagnosis, pancreatectomy, pancreatectom&iacute;a.</p> <hr size=1>     <p><font size="3"><b>Introducci&oacute;n</b></font></p>     <p>Las neoplasias pancre&aacute;ticas representan menos del 10% de las lesiones    qu&iacute;sticas del p&aacute;ncreas; las lesiones benignas son m&aacute;s frecuentes    y, de ellas, el pseudoquiste inflamatorio es la lesi&oacute;n m&aacute;s com&uacute;n    (1). Los carcinomas intraductales mucinosos se diferencian del resto de tumores    del p&aacute;ncreas por su bajo potencial de proliferaci&oacute;n celular y    de invasi&oacute;n, la cual casi nunca afecta el par&eacute;nquima, y representan    el 1% de las patolog&iacute;as malignas del p&aacute;ncreas (2). Esta patolog&iacute;a    es m&aacute;s frecuente en el sexo femenino. </p>     <p>La presentaci&oacute;n cl&iacute;nica es poco definida y, en muchas ocasiones,    el diagn&oacute;stico es un hallazgo incidental en estudios imagenol&oacute;gicos    por otras causas; cuando hay sintomatolog&iacute;a, simula un cuadro obstructivo    de la v&iacute;a biliar (3,4).</p>     <p>El estudio citol&oacute;gico y los marcadores tumorales del contenido qu&iacute;stico,    as&iacute; como el estudio histopatol&oacute;gico de la lesi&oacute;n, sirven    para el diagn&oacute;stico definitivo de la entidad, el cual es guiado con los    estudios de imaginolog&iacute;a. </p>     <p>La neoplasia intraductal mucinosa de p&aacute;ncreas puede progresar a adenoma,    displasia, carcinoma in situ y, eventualmente, hasta carcinoma.</p>     <p><font size="3"><b>Caso cl&iacute;nico</b></font></p>     <p>Se trata de un paciente de 53 a&ntilde;os de sexo masculino con historia de    dolor abdominal cr&oacute;nico y antecedentes de un cuadro similar cuatro a&ntilde;os    antes; el &uacute;nico antecedente personal positivo fue hemorroides sin tratamiento    y hab&iacute;a el antecedente de c&aacute;ncer esof&aacute;gico en el padre.    Consult&oacute; por dolor en mesogastrio, acompa&ntilde;ado de heces ac&oacute;licas    y p&eacute;rdida de peso. </p>     ]]></body>
<body><![CDATA[<p>En el examen se encontr&oacute; leve ictericia y masa en mesogastrio, de 4    cm x 6 cm, no m&oacute;vil y no dolorosa, por lo que se le realiz&oacute; endoscopia    de v&iacute;as digestivas superiores; se encontr&oacute; una masa duodenal,    se hizo una biopsia que se report&oacute; como tumor maligno de p&aacute;ncreas.  </p>     <p>En los ex&aacute;menes de laboratorio se encontr&oacute; bilirrubina directa    de 1,8 mg/dl, y fosfatasa alcalina y amilasas s&eacute;ricas dentro de l&iacute;mites    normales. Se practic&oacute; tomograf&iacute;a de abdomen, en la que se visualiz&oacute;    una masa en la segunda y la tercera porciones del duodeno. </p>     <p>Fue llevado a cirug&iacute;a y se encontr&oacute; un tumor qu&iacute;stico    de la cabeza y el cuerpo pancre&aacute;tico. Se practic&oacute; pancreatoduodenectom&iacute;a    y biopsia por congelaci&oacute;n; el borde de resecci&oacute;n pancre&aacute;tica    en el cuerpo fue negativa para malignidad y se envi&oacute; para estudio histopatol&oacute;gico    (<a href="#figura1">figura 1</a>).</p>     <p>    <center><a name="figura1"></a><img src="img/revistas/rcci/v23n3/a8f1.gif"></center></p>     <p>La descripci&oacute;n macrosc&oacute;pica del esp&eacute;cimen es la de una    dilataci&oacute;n sacular posterior a la ampolla de Vater, que compromete la    pared del duodeno, formaci&oacute;n qu&iacute;stica en la cabeza del p&aacute;ncreas    con contenido mucoide. El estudio microsc&oacute;pico revel&oacute; atrofia    acinar e insular, fibrosis, esclerosis intraductal, cistoesteatonecrosis, dilataci&oacute;n    del conducto pancre&aacute;tico principal, neoplasia intraductal mucinosa con    c&eacute;lulas epiteliales con atipia e invasi&oacute;n de los vasos. No se    encontr&oacute; evidencia de invasi&oacute;n al tejido pancre&aacute;tico adyacente.</p>     <p>El paciente evolucion&oacute; satisfactoriamente en el posoperatorio, no requiri&oacute;    soporte inotr&oacute;pico ni vasoactivo y se dio de alta a los 10 d&iacute;as    despu&eacute;s del ingreso.</p>     <p>Se realizaron controles posoperatorios durante 8 meses con tomograf&iacute;a    computadorizada de abdomen y marcadores tumorales CA19-9 y ACE cada tres meses;    el seguimiento ha sido negativo para recidiva tumoral.</p>     <p><font size="3"><b>Discusi&oacute;n</b></font></p>     <p>La Organizaci&oacute;n Mundial de la Salud (OMS) define las neoplasias intraductales    mucinosas como tumores intraductales productores de mucina con epitelio columnar    con proyecciones papilares o sin ellas (3,5), y los clasifica en benignos, malignos    y lim&iacute;trofes. Entre &eacute;stas neoplasias, el cistoadenoma seroso (32%    a 39%), la neoplasia mucinosa qu&iacute;stica (10% a 45%) y la neoplasia papilar    intraductal (21% a 33%) son los m&aacute;s frecuentes y las neoplasias s&oacute;lidas    pseudopapilares s&oacute;lo representan el 10% (6). </p>     ]]></body>
<body><![CDATA[<p>Recientemente se ha propuesto una nueva clasificaci&oacute;n de estos tumores,    seg&uacute;n su morfolog&iacute;a y patr&oacute;n de expresi&oacute;n de mucinas,    la cual tiene valor pron&oacute;stico; en ella, los de la variedad pancreatobiliar    tienen un pron&oacute;stico peor. </p>     <p>1. Tipo intestinal: Muc1 negativo, Muc2 positivo y CDX2 positivo.    <br>   2. Tipo pancreatobiliar: Muc1 positivo, Muc2 y CDX2 negativo.    <br>   3. Tipo g&aacute;strico foveolar: Muc1 y Muc2 negativos    <br>   4. Tipo oncoc&iacute;tico: Muc1 y Muc2 positivo </p>     <p>Los cistoadenomas se caracterizan por poseer un epitelio c&uacute;bico rico    en gluc&oacute;geno y bajo potencial de malignizaci&oacute;n, y se han encontrado    alteraciones cromos&oacute;micas en el gen 3p25 correspondiente a la enfermedad    de von Hippel Lindau (1,5,7).</p>     <p>Los tumores mucinosos del p&aacute;ncreas se clasifican en dos: la neoplasia    mucinosa qu&iacute;stica y la neoplasia papilar intraductal. La primera, aunque    su patog&eacute;nesis es incierta, se encuentra unida a la presencia de tumores    mucinosos biliares y ov&aacute;ricos, los cuales son casi exclusivos en mujeres,    a diferencia de la neoplasia mucinosa intraductal (3,8,9). La &uacute;nica diferencia    entre las neoplasias mucinosas qu&iacute;sticas y la neoplasia mucinosa papilar    intraductal, es que la &uacute;ltima se comunica con el conducto pancre&aacute;tico    principal. Es com&uacute;n encontrar en los adenocarcinomas ductales mutaci&oacute;n    del gen K ras la cual va paralela al desarrollo de atipias celulares (10,11).</p>     <p>La neoplasia mucinosa papilar intraductal no tiene una presentaci&oacute;n    cl&iacute;nica t&iacute;pica; en muchos casos es un hallazgo incidental en estudios    como ecograf&iacute;as o tomograf&iacute;as abdominales. Cuando hay s&iacute;ntomas,    el paciente consulta por dolor abdominal, ictericia o pancreatitis recurrente    que, por lo general, son sin&oacute;nimo de obstrucci&oacute;n de la v&iacute;a    biliar; cuando el dolor abdominal se da en el marco de un antecedente de pancreatitis    aguda e, incluso, cr&oacute;nica, con hallazgo de lesi&oacute;n qu&iacute;stica    pancre&aacute;tica, se debe descartar un pseudoquiste pancre&aacute;tico antes    de diagnosticar una neoplasia qu&iacute;stica (1,2,12). Una condici&oacute;n    que poco se describe, pero debe tenerse en cuenta, es la presencia de diabetes    con mala respuesta al tratamiento (7,13).</p>     <p>Los ex&aacute;menes para el diagn&oacute;stico de esta patolog&iacute;a son    m&uacute;ltiples. Entre el arsenal diagn&oacute;stico se cuenta con la tomograf&iacute;a,    la cual sirve para caracterizar la lesi&oacute;n y establecer la presencia de    ganglios y si hay pancreatitis asociada. En la tomograf&iacute;a se encuentra    que la mayor&iacute;a de las lesiones comprometen el cuerpo o la cola del p&aacute;ncreas    (<a href="#figura2">figura 2</a>), raramente hay ganglios murales y calcificaciones    en la pared, pero cuando est&aacute;n presentes, son espec&iacute;ficos de la    neoplasia mucinosa.</p>     <p>    ]]></body>
<body><![CDATA[<center><a name="figura2"></a><img src="img/revistas/rcci/v23n3/a8f2.gif"></center></p>     <p>La colangiorresonancia (resonancia magn&eacute;tica), por su parte, sirve para    determinar si hay comunicaci&oacute;n entre la lesi&oacute;n qu&iacute;stica    y el conducto pancre&aacute;tico (14-16).</p>     <p>La ultrasonograf&iacute;a endosc&oacute;pica es una de las herramientas m&aacute;s    &uacute;tiles, especialmente para determinar malignidad y la presencia de multicentricidad,    con una sensibilidad de 86% cuando los ductos principales miden m&aacute;s de    10 mm y los secundarios m&aacute;s de 40 mm (14).</p>     <p>La colangiopancreatograf&iacute;a por resonancia magn&eacute;tica nos ayuda    a determinar la extensi&oacute;n de la dilataci&oacute;n, el n&uacute;mero de    ganglios murales y la presencia de comunicaci&oacute;n entre el quiste y el    conducto. Estos hallazgos se relacionan con un mal pron&oacute;stico, especialmente    la presencia de dilataci&oacute;n del conducto pancre&aacute;tico principal    mayor de 10 mm y la presencia de ganglios murales (10,18,19).</p>     <p>En el estudio citol&oacute;gico, la presencia de c&eacute;lulas epiteliales    no g&aacute;stricas elimina la posibilidad de pseudoquiste, ya que no posee    este tipo de c&eacute;lulas, y nos orienta hacia las neoplasias mucinosas, que    se diferencian de la contaminaci&oacute;n con material del tubo digestivo porque    &eacute;ste &uacute;ltimo es m&aacute;s delgado y carece de c&eacute;lulas inflamatorias    y de degeneraci&oacute;n (3,20,21).</p>     <p>El estudio citol&oacute;gico ayuda en el diagn&oacute;stico, especialmente,    cuando se realizan pruebas de marcadores tumorales y pruebas bioqu&iacute;micas.    Las amilasas son el primer estudio que se solicita; cuando est&aacute;n muy    elevadas pueden orientarnos a una neoplasia papilar intraductal. Si est&aacute;n    aumentadas, la siguiente prueba es el ant&iacute;geno carcinoembrionario, que    cuando es positivo es fuerte predictor es un importante factor pron&oacute;stico    de quiste mucinoso y cuyo aumento es proporcional a la probabilidad de malignidad    (17,22).</p>     <p>Otros marcadores tumorales empleados son el CA 72-4 y el Ca 19-9; aunque sus    niveles para diagn&oacute;stico en l&iacute;quido no se han determinado, son    &uacute;tiles en la diferenciaci&oacute;n de lesiones mucinosas y no mucinosas.(1,3,23)</p>     <p>La presencia de mucina no especifica el grado patol&oacute;gico del tumor y    que sea negativa no excluye la presencia de neoplasia intraductal mucinosa de    p&aacute;ncreas; las c&eacute;lulas epiteliales de uniones fuertes est&aacute;n    asociadas a neoplasias con displasia moderada y, las c&eacute;lulas inflamatorias    y la paracromatina, con el carcinoma in situ. La necrosis est&aacute; asociada    a la invasi&oacute;n (4) (<a href="#figura3">figura 3</a>).</p>     <p>    <center><a name="figura3"></a><img src="img/revistas/rcci/v23n3/a8f3.gif"></center></p>     ]]></body>
<body><![CDATA[<p>El diagn&oacute;stico diferencial de la neoplasia intraductal mucinosa del    p&aacute;ncreas incluye el pseudoquiste y las neoplasias qu&iacute;sticas. Es    importante la diferenciaci&oacute;n entre estas dos patolog&iacute;as, ya que    el manejo en la primera es generalmente conservador, mientras que las segundas    requieren manejo quir&uacute;rgico (1,3,24).</p>     <p>Durante la cirug&iacute;a se obtiene el l&iacute;quido pancre&aacute;tico a    trav&eacute;s de la aspiraci&oacute;n de los conductos pancre&aacute;ticos y    la administraci&oacute;n de secretina (25), la cual aumenta la producci&oacute;n    de jugo pancre&aacute;tico para el citodiagn&oacute;stico, con el fin de determinar    los segmentos que se deben resecar, con base en la relaci&oacute;n n&uacute;cleo/citoplasma,    la forma del n&uacute;cleo, la distribuci&oacute;n de la cromatina nuclear y    el estado de la mucina (2) (<a href="#figura4">figura 4</a>).</p>     <p>    <center><a name="figura4"></a><img src="img/revistas/rcci/v23n3/a8f4.gif"></center></p>     <p>La mayor&iacute;a de las lesiones qu&iacute;sticas del p&aacute;ncreas se encuentran    en la cola, y, generalmente, la pancreatectom&iacute;a distal basta en las lesiones    premalignas, pero la neoplasia intraductal papilar es m&aacute;s frecuente en    la cabeza del p&aacute;ncreas (13), por lo que requiere pancreatoduodenectom&iacute;a    (26-28). Sin embargo, como &eacute;sta crece de manera longitudinal sobre el    conducto, los bordes deben estudiarse intraoperatoriamente para confirmar que    &eacute;ste quede libre de tumor. El 19% de los pacientes requiere pancreatectom&iacute;a    total por la extensi&oacute;n del tumor en el conducto (1,2,10,29).</p>     <p>Algunos autores hablan sobre un origen multic&eacute;ntrico de las lesiones,    por lo cual los bordes libres de tumor no son un factor completamente confiable    de resecci&oacute;n completa del c&aacute;ncer. Sin embargo, los bordes libres    sin evidencia de lesi&oacute;n trasmural se asocian a una supervivencia cercana    al 100%, en el 21% de los casos, hay recurrencias por lesiones de tipo multic&eacute;ntrico    (22,30,31), por lo que se requieren otras formas de encontrar estas lesiones    para determinar el borde verdadero de resecci&oacute;n. Entre ellas est&aacute;n    la citolog&iacute;a intraoperatoria por segmentos de jugo pancre&aacute;tico    m&aacute;s la biopsia por congelaci&oacute;n, en las que, si la histolog&iacute;a    sale positiva, se agregan 2 cm de resecci&oacute;n hasta obtener bordes libres;    y si la citolog&iacute;a resulta positiva, se resecan los segmentos en los que    la citolog&iacute;a es positiva para malignidad (23,25,32).</p>     <p>El pron&oacute;stico de los tumores papilares mucinosos intraductales del p&aacute;ncreas    depende de la presencia de infiltraci&oacute;n; hay supervivencia mayor al 90%    a 5 a&ntilde;os si no se encuentra infiltraci&oacute;n y, de 40%, en el caso    de los carcinomas invasivos (4,14). Otro factor que se ha visto asociado con    un mejor pron&oacute;stico es el crecimiento tumoral a partir de ramas secundarias    de los conductos pancre&aacute;ticos, en lugar del conducto pancre&aacute;tico    principal (7).</p>     <p>En casos seleccionados, en los que el tumor mide menos de 30 mm, no hay invasi&oacute;n    mural y s&oacute;lo afecta las ramas secundarias del p&aacute;ncreas, y sin    cambios en el seguimiento, puede realizarse un manejo no quir&uacute;rgico,    de observaci&oacute;n radiol&oacute;gica, con marcadores tumorales y mediciones    de glucemia, ya que el potencial de malignizarse o de crecer es de 11%, a diferencia    de los carcinomas que afectan las ramas principales, cuyo potencial maligno    es alto (60%) y que requieren manejo quir&uacute;rgico (19,22,33).</p>     <p>La neoplasia papilar intraductal mucinosa es una entidad poco frecuente caracterizada    por la comunicaci&oacute;n con el conducto pancre&aacute;tico principal, raramente    sintom&aacute;tica, y generalmente es un hallazgo incidental.</p>     <p>La tomograf&iacute;a, la colangiorresonancia, la ultrasonograf&iacute;a endosc&oacute;pica    y el estudio citol&oacute;gico por colangiograf&iacute;a endosc&oacute;pica,    son los m&eacute;todos m&aacute;s confiables para el diagn&oacute;stico y pron&oacute;stico    de la enfermedad. Estos tumores suponen un reto para el cl&iacute;nico, ya que    pueden confundirse con lesiones benignas qu&iacute;sticas, lo que conlleva a    la contradicci&oacute;n entre el manejo quir&uacute;rgico o el seguimiento de    la lesi&oacute;n.</p>     ]]></body>
<body><![CDATA[<p>La biopsia por congelaci&oacute;n y la citolog&iacute;a intraoperatoria han    marcado la pauta para el manejo de estas lesiones y la determinaci&oacute;n    de los bordes de resecci&oacute;n frente a la pancreatectom&iacute;a total,    lo que ha mejorado el pron&oacute;stico de los pacientes con esta patolog&iacute;a.</p>     <p>El tratamiento de esta patolog&iacute;a debe ser quir&uacute;rgico; la extirpaci&oacute;n    completa del tumor por pancreatoduodenectom&iacute;a o pancreatectom&iacute;a    total.</p>     <p><font size="3"><b>Referencias</b></font></p>     <!-- ref --><p>1. Brugge WR, Lauwers GY, Sahani D, Fern&aacute;ndez-del Castillo C, Warshaw    AL. Cystic neoplasms of the pancreas. N Engl J Med. 2004;351:1218-26. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000076&pid=S2011-7582200800030000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Eguchi H, Ishikawa H, Ohigashi T, Sasaki Y, Yamada T, Nakaizumi A, Uehara    H, Takenaka A, Kasugai T, Imaoka S. Role of intraoperative cytology combined    with histology in detecting continuous and skip type intraductal cancer existence    for intraductal papillary mucinous carcinoma of the pancreas. Cancer. 2006;107:2567-75.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000077&pid=S2011-7582200800030000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>3. 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