malignant neoplasm of extrahepatic bile duct TNM staging regional lymph nodes (N) N0
malignant neoplasm of extrahepatic bile duct tnm staging regional lymph nodes (n) n0
malignant tumor of extrahepatic bile duct TNM staging regional lymph nodes (N) N0
malignant tumor of extrahepatic bile duct tnm staging regional lymph nodes (n) n0