Another case of villous adenoma of the transverse colon, this one more discrete and polyp-like. Although it had a semi-decent stalk, it was still far too large for safe removal by endoscopy, so the surgeon was called in to do a segmental resection of the colon. Prior to photographing, the specimen was pinned out in formalin and fixed overnight. The pink color in the center of the mass indicates that the formalin did not penetrate the whole lesion. Shame on me for being chintzy with the formalin! Note how the surface texture of the villous adenoma differs markedly from that of the surrounding colonic mucosa.
Source: Ed Uthman, MDOriginal file here.