[Carcinoma originating in a hepatic cyst of polycystic disease--a case report].

A 53-year-old woman with polycystic disease was admitted because of abdominal distention and dyspnea. Percutaneous puncture was performed and adenocarcinomatous cells were seen in the contents of the main liver cyst. A right hepatic lobectomy was carried out, and a hard nodule was found to arise from the wall of the main liver cyst. Microscopically the nodule was poorly differentiated adenocarcinoma and CEA was seen both in the epithelium of the liver cyst and in the tumor cells by the PAP method. We consider that the tumor originated in the cyst of the polycystic liver. Five similar cases were reported up to 1984.