The non-visualizing gallbladder.
D000368:Aged; D001650:Bile Duct Neoplasms / Q000175:diagnosis*; D002277:Carcinoma / Q000175:diagnosis*; D002763:Cholecystectomy; D002765:Cholecystography; D003937:Diagnosis, Differential; D005260:Female; D005706:Gallbladder Neoplasms / Q000175:diagnosis*; D006801:Humans; D007813:Laparotomy; D008297:Male; D008875:Middle Aged