title: The "O" sign.
authors.affiliation: Department of Radiology, Wake Forest Baptist Medical Center, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, NC, 27157, USA. choffman@wakehealth.edu.
authors.forename: Cane F
authors.initials: CF
authors.lastname: Hoffman
authors.affiliation: Department of Radiology, Wake Forest Baptist Medical Center, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, NC, 27157, USA.
authors.forename: Larkin L
authors.initials: LL
authors.lastname: Selman
authors.affiliation: Department of Radiology, Wake Forest Baptist Medical Center, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, NC, 27157, USA.
authors.forename: Raymond B
authors.initials: RB
authors.lastname: Dyer
mesh_terms: D003287:Contrast Media; D005471:Fluoroscopy; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging*; D015391:Gastroplasty / Q000295:instrumentation*; D006801:Humans; D011183:Postoperative Complications / Q000000981:diagnostic imaging*; D011860:Radiography, Abdominal
chemical_list: D003287:Contrast Media