Primary non-functioning neuroendocrine tumor of the extrahepatic bile duct.

In contrast to the primary biliary carcinoma or cholangiocarcinoma, other tumors derived from the bile duct are difficult to diagnose preoperatively, mainly because of its low incidence and difficult diagnostic process. However, since cholangiocarcinomas account for about 80% of all primary biliary tumors, it is important to think about other options despite their low frequency when a patient presents with abnormal characteristics. We present a case of a primary neuroendocrine tumor of the bile duct, and a review of the literature on this rare disease.