title: The visible gallbladder: a plain film sign of pneumoperitoneum.
authors.affiliation: Department of Radiology, University of Southern California School of Medicine, Los Angeles County--USC Medical Center 90033, USA.
authors.forename: R
authors.initials: R
authors.lastname: Radin
authors.forename: R J
authors.initials: RJ
authors.lastname: Van Allan
authors.forename: R S
authors.initials: RS
authors.lastname: Rosen
mesh_terms: D000368:Aged; D002765:Cholecystography; D003108:Colonic Diseases / Q000150:complications / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007416:Intestinal Perforation / Q000150:complications / Q000000981:diagnostic imaging; D008875:Middle Aged; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging*