An Unusual Case of Polypoid Angiodysplasia - Kakushima, N; Fujishiro, M; Yahagi, N; Oka, M; Kobayashi, K; Hashimoto, T; Miyoshi, H; Moriyama, Y; Enomoto, S; Iguchi, M; Ichinose, M; Omata, M (Endoscopy, 2004)