Fig. 3

a Excised tissue. A polypoid lesion with a dark-red center is visible. b Histopathological findings. Irregularly dilated blood vessels lined by the endothelium were noted in the submucosal area. There were very few smooth muscles in the vessel wall. The submucosa was edematous, although the inflammatory findings were minor. The mucosal surface was locally eroded (Hematoxylin and Eosin staining, × 2.5)