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A. The lesion in the sigmoid colon. B. An image with a fishbone penetrates to the peritoneal cavity.
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He was sutured the perforated hole in the sigmoid colon and performed ileostomy (Fig. 1).
Histological examination of polyp showing the atypical melanocytic cell with pigmented debris in cytoplasm infiltrating the gland. A: H.E x 100; B and C: H.E x 400.
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Histopathology showed features of malignant melanoma (Fig. 2).
Immunohistochemistry A. S100 x 400 pos; B. HMB45 x 400 pos, C. Vimentin x 100 pos, D. CD68 x 100 neg, E. AE1/3 x 100 neg, F. P53 x 100 + sporadic.
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And Immunohistochemical results determined the diagnosis of colorectal mucosa melanoma with Protein S-100, HMB45, vimentin-positive; AE1/3, CD68, and P53 negative (Fig. 3).
A. Postoperative piece. The resected polyp's root with pigmented lesion spreading out the dentate line (surgical specimen). B. H.E x 100. Histopathology showed the pigmented atypical melanocytic cell infiltrating into the muscle with 7 mm of thickness.
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Histopathological results were benign pigmented tumors (Fig. 4).