Intestine, tumours of

Cancerous or noncancerous growths in the intestine. Cancerous tumours commonly affect the large intestine (see colon, cancer of; rectum, cancer of); the small intestine is only rarely affected. Lymphomas and carcinoid tumours (leading to carcinoid syndrome) may sometimes develop in the intestine; noncancerous tumours include polyps in the colon, and adenomas, leiomyomas, lipomas, and angiomas in the small intestine.