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.
Left: 5 mm submucosal lesion in the sigmoid colon of a 54 year old man undergoing colonoscopy for hematochezia and iron
deficiency anemia. Histology revealed a carcinoid tumor.
Center: 5 mm smooth potentially submucosal polypoid lesion in the sigmoid colon, was completely excised with a
snare. Histology revealed a well-differentiated carcinoid.
Right: 7-8 mm smooth firm submucosal lesion in the rectum of a 63 year old with a history of colon polyps. Multiple
superimposed biopsies were obtained. Histology revealed carcinoid tumor with no abnormal mitoses or necrosis.
Left: Lobulated 1 cm submucosal rectal lesion in a 39 year old woman undergoing colonoscopy for hematochezia.
Histology and immunohistochemical stains were indicative of a well-differentiated carcinoid tumor.
Right: 64 year old man with a family history of colon cancer, had several benign adenomas as well as this
1.5 cm sessile polyp in the rectum, which proved to be a well-differentiated, low grade carcinoid tumor.
50 year old woman with a change in bowel habit. Colonoscopy revealed a 3.5 cm pedunculated polyp in the distal rectum. Histology described a low-grade neuroendocrine (carcinoid) tumor with no abnormal mitoses or foci of tumor necrosis. The change in bowel habit was constipation, presumably caused by partial rectal outlet obstruction by the polyp, as symptoms resolved following snare polypectomy.
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