Esophagoscopy.
D004935:Esophageal Diseases / Q000175:diagnosis; D004940:Esophageal Stenosis / Q000175:diagnosis; D004932:Esophageal and Gastric Varices / Q000175:diagnosis; D004945:Esophagoscopy / Q000009:adverse effects; D004947:Esophagus; D005547:Foreign Bodies / Q000175:diagnosis; D006801:Humans; D008722:Methods