Primary neoplasms of the duodenum.
D000293:Adolescent; D000368:Aged; D004379:Duodenal Neoplasms / Q000453:epidemiology* / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007415:Intestinal Obstruction; D007890:Leiomyosarcoma / Q000175:diagnosis; D008228:Lymphoma, Non-Hodgkin / Q000175:diagnosis; D008297:Male; D011859:Radiography