title: New observations on the cholangiographic pseudocalculus defect: a case report.
abstract: Contraction of the distal sphincter of the common bile duct (as distinct from the sphincter of Oddi) may produce a pseudocalculus defect. A typical case is described where the defect was thought to be a retained stone on T-tube cholangiography. The anatomy of the defect is emphasized by its persistence after sphincteroplasty. A diagnostic feature is the immediate abolition of the defect by hyoscine butylbromide (Buscopan, Boehringer Ingelheim).
mesh_terms: D002758:Cholangiography; D003135:Common Bile Duct / Q000187:drug effects*; D042882:Gallstones / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012601:Scopolamine
chemical_list: D012601:Scopolamine