How can we diagnose the depth of cancer invasion in the esophagus?
D000368:Aged; D004938:Esophageal Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D004945:Esophagoscopy; D004947:Esophagus / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008875:Middle Aged; D011859:Radiography; D014463:Ultrasonography