PMC3615979_01
Rectosigmoidoscopy showing polypoid and pigmented tumor.
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A rectosigmoidoscopy showed a 2 cm- polypoid, ulcerated, pigmented tumor in the lower third of the rectum (Figure 1).
Immunohistochemical staining demonstrating strong staining with HMB-45.
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Staining for S-100, Melan A and HMB-45 (Figure 2) were positive.