title: Obscuration of opaque gallstones in oral cholecystography.
mesh_terms: D000328:Adult; D002765:Cholecystography; D002769:Cholelithiasis / Q000000981:diagnostic imaging*; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008875:Middle Aged; D011860:Radiography, Abdominal