title: Rigler sign: an underappreciated alert for pneumoperitoneum.
abstract: A patient presented with abdominal pain. Supine abdominal radiograph disclosed free intraperitoneal air (Rigler sign). This finding prompted further work-up and treatment.
authors.affiliation: 1st Department of Propaedeutic Surgery, Hippokrateion Hospital, Athens Medical School, University of Athens, Athens, Greece. markogiannakis@easy.com
authors.forename: Haridimos
authors.initials: H
authors.lastname: Markogiannakis
authors.forename: Klio
authors.initials: K
authors.lastname: Fili
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Spaniolas
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Bizimi
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Katsiva
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Theodorou
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D010439:Peptic Ulcer Perforation / Q000150:complications / Q000601:surgery*; D010808:Physical Examination; D011027:Pneumoperitoneum / Q000175:diagnosis* / Q000209:etiology; D013276:Stomach Ulcer / Q000150:complications / Q000601:surgery*