A CASE OF BILIARY CYSTADENOMA

Biliary cystadenoma is very rare indeed, but is known to have a tendency to malignant alternation. We reported a case below. A 67-year-old female underwent operation with epigastralgia as chief complaint. A deroofing was carried out and no malignancy was confirmed by intraoperative frozen section. Postoperative histological diangosis was made as biliary cystademoma. We examined 8 cases of biliary cystadenoma and 47 cases of biliary cystic adenocarcinoma reported in Japan. We tried to clarify the difference between biliary cystadenoma and biliary cystic adenocarcinoma from the view-point of imaging diagnosis. The following was revealed: 1) Cystic adenocarcinoma often has interamural papillary projections in CT and US. 2) Papillary tumor was enhanced by contrasted CT. 3) Internal solid components had an accumulation of contrast material in angiograpy.