Intestinal disorders. Illustration showing Crohns disease, polyps, ulcerative colitis, diverticul- itis, carcinoma and haemorrhoids. The small intestine (centre) shows Crohn's disease (chronic inflammation). Polyps are present in the small & large intestines. Ulcerative colitis is present in the transverse & descending colon (top right). The descending colon (right) shows spasm causing narrowing of the intestinal lumen. The sigmoid colon is affected by diverticulosis, where small pouches (brown) protrude from the intestinal wall & may become inflamed. A malignant tumour is growing in the upper rectum, and haemorrhoids (blue & red) are present in the rectum and anus.