The pseudocalculus sign in cholangiography.
D001650:Bile Duct Neoplasms / Q000000981:diagnostic imaging; D002758:Cholangiography; D003135:Common Bile Duct / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D042882:Gallstones / Q000000981:diagnostic imaging*; D006801:Humans