Benign, small bowel tumors most often include:
Malignant tumors may include:
- Adenocarcinoma, which is rare but may appear with Crohn's disease in the small intestine
All of these types of tumors may cause symptoms that need surgery. They sometimes block the bowel or cause pain or bleeding. Malignant lymphoma that starts in the small intestine may cause a long segment of the small intestine to feel rigid. Kaposi's sarcoma, which occurs in an aggressive form in transplant recipients and AIDS patients, involves the stomach or intestines in 40 to 60% of cases. Lesions in the digestive tract usually do not cause symptoms but may cause other conditions, including bleeding diarrhea.