ABSTRACT
Objective TodiscusstheCTimagingfeaturesanddifferentialdiagnosisofhilarcholangiocarcinomawithdifferent grossclassifications.Methods 83casesofperihilardiseasesconfirmedbyhistopathologywereanalyzedretrospectivelybytworadiologists. CTimagingfeaturesandenhancementpatternsinhilarcholangiocarcinomawithdifferentgrossclassificationsandotherperihilarbenign diseaseswerecomparedtoseeiftherewasasignificantdifference.Results Ofall,15caseswithintraductalgrowinghilarcholangiocarcinoma, theaxialdiametersweresignificantlylargerthanperihilarbenigndiseases,andallofthem werewash-inandwash-outpatternof enhancement.38caseswereperiductalinfiltratinghilarcholangiocarcinomawithsignificantlyshorterlongitudinallength,mostlywith biliarystricture,bileductthicknessandsoftrattandistantbiliarydilatation.Mostofthem werewash-inandwash-outpatternof enhancement.30casesweremass-forminglesions.Hilarmass-forminglesionsweremostlyhilarcholangiocarcinoma,andtheenhancement patternswerepersistentandprogressiveenhancements.Conclusion Differentgrossclassificationsofhilarcholangiocarcinomahave differentCTfeatures,includingthesize,morphology,indirectsignsandenhancementpatterns,whichcanbeusedtodistinguishwith thehilarbenignlesions.