Colonic arteriovenous malformation in a child misinterpreted as an idiopathic colonic varicosis on angiography: remarks on current classification of childhood intestinal vascular malformations - Defreyne, L; Meersschaut, V; van Damme, S; Berrevoet, F; Robberecht, E; Praet, M (Eur Radiol, 2003)