Table 1 Causes of lower gastrointestinal bleeding (20)

Vascular lesions

Tumors of small intestine

Less common causes

• Angiodysplasia

• Leiomyoma

• Ulcerations of small intestine

(Crohn's disease, Meckel's diverticulum, Zollinger-Ellison Syndrome)

• Telangiectasia

• Leimyosarcoma

• Vasculitis

• Venous ectasia

• Carcinoid tumors

• Infectious bowel disease

• Hemangioma

• Adenocarcinoma

• Radiation enteritis

• Arteriovenous malformation

• Lymphoma

• Dieulafoy's lesion

• Adenomatous polyps

• Metastases