A Case of Collision Tumor of the Common Bile Duct: Carcinoid and Adenocarcinoma

Naoki Igarashi, Munehisa Kaneda, Yasumasa Koyama and Makoto Katagiri

Department of Surgery, Eiju General Hospital

In this paper, a very rare case of a collison tumor of carcinoid and adenocarcinoma in the common bile duct is reported. A 58-year-old male was admitted to our clinic because of jaundice. An abdominal ultrasonography, computed tomography and percutaneus transhepatic cholangiography detected a tumor, 25mm in size, in the lower part of the common bile duct. A pancreaticoduodenectomy was performed under a diagnosis of carcinoma. The resected specimen was white yellow tumor, 22×25mm in size, mulberry growing and a papillary growing tumor with a different color in the lower part of the common bile duct. A histological study demonstrated the presense of a collison tumor between a carcinoid tumor that stained positively with chromogranin and a papillary adenocarcinoma. Carcinoid of the common bile duct is a very rare disease and only 36 cases have been reported. None of these cases were preoperatively diagnosed as carcinoid tumors. Furthermore, the co-existance of carcinoid and adenocarcinoma in the common bile duct has been reported in only 6 cases. The treatment for the carcinoids of the common bile duct is the same as that for carcinomas of the common bile duct.

Key words
carcinoid tumor, common bile duct carcinoma, carcinoid of the common bile duct

Reprint requests
Naoki Igarashi Department of Surgery, Eiju General Hospital 2-11-7 Motoasakusa, Taito-ku Tokyo, 111-8656 JAPAN

Accepted
July 31, 2001

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