A CASE OF SQUAMOUS CELL CARCINOMA OF THE DISTAL EXTRA HEPATIC BILE DUCT

Typical pathological type of carcinomas in the biliary tract is adenocarcinoma. In rare occasions, partial squamous cell carcinoma components can be found in these cancer tissues, although pure squamous cell carcinoma is hardly encountered. We herein report a case of a 63-year-old man with the complaint of jaundice, whose tumor was successfully resected by a pancreatoduodenectomy. A pathological study revealed pure squamous cell carcinoma originating from the lower common bile duct. Previously published articles have inferred cancer change subsepuent to squamous metaplasia or metaplastic change of adenocarcinoma as the origin. However, the etiology of this rare tumor has not been elucidated as yet. Further investigations are essential for understanding of the tumor.