title: Primary malignant neoplasms of the small intestine.
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology; D000328:Adult; D000368:Aged; D002276:Carcinoid Tumor / Q000453:epidemiology; D003937:Diagnosis, Differential; D006801:Humans; D007414:Intestinal Neoplasms / Q000175:diagnosis / Q000453:epidemiology*; D007421:Intestine, Small; D007890:Leiomyosarcoma / Q000453:epidemiology; D008223:Lymphoma / Q000453:epidemiology; D008875:Middle Aged; D009518:New York