A CASE REPORT RESULTED IN BILIARY CYSTADENOCARCINOMA AFTER THE OPERATION FOR BILIARY CYSTADENOMA

Biliary cystadenocarcinoma is a very rare disease and difficult to diagnose before surgery. The patient, a 79-year-old woman, was admitted to our hospital with the chief complaint of a tumor in the right upper abdomen. The patient was diagnosed a simple hepatic cyst and the deroofing was performed, judging from general conditions. Considering recurrence and malignant change, subsequent observation was carried out, and an abdominal tumor was found one year and eight months after the operation. Biliary cystadenocarcinoma was diagnosed from CT scan, angiography, etc. When laparotomy was perfomed again, an uneven and irregular tumor in the left hepatic lobe, the greater and lesser omenta changing to a mass, and disseminated metastases to the peritoneum and mesentery were found. The tumor enucleation and the excision of the greater and lesser omenta were performed. As the number of case reports of this disease in Japan is very rare, i.e., 27 cases including ours, and the preoperative diagnosis is difficult, it is thought to be significant to compile these case reports and report these details.