A case of mucinous carcinoma of the residual cystic duct that developed 4 years after cholecystectomy

Abstract

A 73-year-old man underwent laparoscopic cholecystectomy for cholecystitis caused by gallstones 4 years ago. During the examination of a colon tumor, PET-CT revealed an accumulation of FDG in the surgical site of the gallbladder. Abdominal CT revealed a soft tissue shadow corresponding to the residual cystic duct from the metal clip at the closed end of the cystic duct to the bile duct. The mass had invaded S5 of the liver. Suspecting residual cystic duct carcinoma, extrahepatic bile duct resection, S5 partial resection, and lymph node dissection were performed. A cross section revealed a 22 × 20mm mucinous mass with a relatively clear border to the liver. The tumor was diagnosed as mucinous carcinoma of the residual cystic duct. The patient has been alive without recurrence for 5 years with postoperative radiotherapy and oral administration of S-1.