According to the OMS classification of the epithelial benign neoplasm of the liver, the adenomas represent the most important group. In literature an increase of their incidence in the last years is reported especially in the female sex, in relationship to the diffusion of the use of hormonal contraceptives. The biliar cistoadenoma (BCA) represents a not frequent neoplasm of the liver that has origin on the inside of the liver, and less frequently from the extrahepatic biliar system. The surgical interest is underlined by the potentiality of the malignant evolution of the lesion and by its high tendency to the relapse. The real difficulty is represented by differential diagnosis from the other cystic lesions of the liver and by the need of its radical excision and therefore of real hepatectomy.
