Colonic angiodysplasia is a common cause of acute or chronic rectal bleeding and iron deficiency anaemia.
Angiodysplasias are tiny - 1-5 mm in diameter - hamartomatous capillary lesions in the colonic wall which produce bleeding out of proportion to their size. They are believed to be acquired, possibly as a result of tension on the veins where they pass through the muscularis.
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