The radiopaque esophageal marshmallow bolus.
D002277:Carcinoma / Q000000981:diagnostic imaging; D003680:Deglutition Disorders / Q000000981:diagnostic imaging*; D004935:Esophageal Diseases / Q000000981:diagnostic imaging*; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging*; D005471:Fluoroscopy; D005769:Gastrointestinal Motility; D006548:Hernia, Diaphragmatic / Q000000981:diagnostic imaging; D006801:Humans