Vascular malformations which may be found throughout the gastrointestinal tract. Although they may be found anywhere in the colon and at any age, they are more often seen in elderly patients in the proximal colon, and at younger ages when aortic valve stenosis is present. Bleeding is most often mild and intermittent.
A pair of angiodysplastic lesions (left) in the rectum, responsible for significant bleeding in a 77 year-old man who had presented with rectal bleeding. The lesions were successfully eradicated (right) with an argon plasma coagulator, and there was no further bleeding.
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