Abnormal biliary tract morphology Increased inflammatory response Cholangitis true Cholangitis is characterized by biliary epithelial damage with inflammatory cell infiltration. Some cholangitis is also associated with ductal and periductal fibrosis. MP:0003254 UMLS:C0008311 Bile duct inflammation NCIt:C26718 MESH:D002761 DOID:9446 ICD9:576.1 SNOMEDCT:82403002 SNOMEDCT_US:82403002 Inflammation of the biliary ductal system, affecting the intrahepatic or extrahepatic portions, or both.