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Arteriovenous malformation

Arteriovenous malformation or (AVM) is a congenital disorder of unknown cause, which produces diffuse or localized vascular lesions consisting of tangle(s) of vessels with abnormal connections and no capillaries. Since the normal structure of the vessels are lacking, they are extremely fragile and easy to bleed. AVMs can occur in various parts of the body including the brain, spleen, lung, kidney and liver. AVMs may occur in isolation or as a part of another disease (e.g. von Hippel-Lindau disease[?]).

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