Bile duct carcinoma associated with an anomaly in the bile duct.

This paper reports a case of bile duct carcinoma associated with an extra-hepatic bile duct anomaly. In the present case, the anomaly induced an uncorrect preoperative diagnosis and obliged to change the surgical procedures during operation. A correct preoperative diagnosis was difficult to make in the present case, when the anomaly in the biliary system was not kept in mind.