title: Rigler sign: a subtle finding of pneumoperitoneum.
authors.affiliation: St. Luke's-Roosevelt Hospital Center, Columbia College of Physicians and Surgeons, 1111 Amsterdam Ave, New York, NY 10025, USA.
authors.forename: Jarone
authors.initials: J
authors.lastname: Lee
authors.forename: Sapna
authors.initials: S
authors.lastname: Pawa
authors.forename: Joshua
authors.initials: J
authors.lastname: Quaas
authors.forename: Kaushal H
authors.initials: KH
authors.lastname: Shah
mesh_terms: D015746:Abdominal Pain / Q000175:diagnosis / Q000000981:diagnostic imaging; D000368:Aged; D005260:Female; D006801:Humans; D011027:Pneumoperitoneum / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D011859:Radiography