Arteriovenous malformation of the forearm as a result of a persistent median artery.

Most arteriovenous malformations usually arise from pre-existing named vessels. We report an unusual variant of an arteriovenous malformation. An 18-year-old man presented with a painful swelling of the right forearm. Arteriograms suggested branches of the anterior interosseous artery were feeding the malformation. Operative findings however, revealed the presence of a persistent median artery, which was contributing branches to the swelling.