PMC3806709_01
Endoscopic view of the pedunculated polyp in the ascending colon.
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F1
Findings included a 20-mm pedunculated polyp with a stalk measuring 0.6 cm in length and 0.4 cm in diameter in the ascending colon (fig. 1), and an 8-mm polyp in the transverse colon removed with polypectomy and a 3-mm polyp in the ascending colon removed with biopsy forceps.
Histological features of colonic neurofibroma. Low-power view of hematoxylin and eosin-stained colonic mucosa with bland spindle cell proliferation in the submucosa (original magnification x10).
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F2
Histologically, the pedunculated ascending colon polyp revealed bland spindle cell proliferation in the submucosa (fig. 2, fig. 3).
Immunohistochemical features of colonic neurofibroma. The tumor cells are strongly positive for S100 protein immunostaining (original magnification x40).
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F4
Immunohistochemical stains showed that the tumor cells were immunoreactive to S100 protein (fig. 4) and were non-reactive to CD117, SMA and desmin antibodies.