Introduction.

Biliary mucinous cystadenoma is a rare neoplasm with a high probability of malignancy. Its diagnosis is a challenge since it resembles other benign masses that can be found in the liver.

Clinical case.

A 21-year-old woman with a sensation of a mass in the right hypochondrium, who underwent tumor markers and imaging studies, concluding with a diagnosis of biliary mucinous cystadenoma.

Result.

A case of a patient with biliary mucinous cystadenoma diagnosed and successfully treated by surgery is presented.

Conclusion.

The diagnosis of biliary mucinous cystadenoma is confirmed by tumor markers and radiological studies, and its treatment is surgical due to the risk of malignancy.

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