Left: 30 year-old woman with occult blood in the stool and a palpable rectal nodule on digital exam. Direct visualization by colonoscopy revealed this erythematous polypoid mucosal nodule, which grossly appreared inflammatory. The lesion was excised and histologically proved to be a carcinoid.
Center: Small rectal nodule in a 47 year-old man with occult bleeding. The lesion was best seen on retroflexion, as shown here. The yellowish color suggested the possibility of a lipoma, but biopsies proved the lesion to be a carcinoid.
Right: Similar yellow raised musocal nodule found in the rectum of a 42 year-old woman. Histology was that of a carcinoid.
Left: Smooth 8 mm submucosal polypoid lesion with a pseudo-stalk, at the rectosigmoid junction in a 57 year-old man.
Center: Smooth submucosal polypoid lesion grossly resembling a lipoma. Unlike a lipoma, however, the lesion was firm. The lesion was completely excised at colonoscopy, and histologically proved to be a carcinoid tumor.
Right: 67 year-old undergoing colonoscopy for a history of colon cancer, had a smooth polypoid lesion in the rectum measuring 8 mm. Histology revealed carcinoid.
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