Epidemiology of hilar cholangiocarcinoma in Egypt: single center study.

Background/aims: Cholangiocarcinoma is the second most frequent malignant tumor of the liver after hepatocellular carcinoma. The incidence rates of hilar cholangiocarcinoma (CC) vary greatly among different areas of the world, this variation is related to distribution of risk factors. The aim of this work is to study epidemiology and possible risk factors in the North East delta of Egypt.