Extrahepatic Bile Duct Adenoma, also known as adenoma of the extrahepatic bile duct, is related to adenoma and villous adenoma. An important gene associated with Extrahepatic Bile Duct Adenoma is PMS2 (PMS1 Homolog 2, Mismatch Repair System Component), and among its related pathways/superpathways are Homology Directed Repair and Regulation of TP53 Activity. Related phenotypes are Synthetic lethal with MLN4924 (a NAE inhibitor) and neoplasm