case_images: PMC7519280_01
case_images: A. The lesion in the sigmoid colon. B. An image with a fishbone penetrates to the peritoneal cavity.
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case_images: fig0005
case_images: He was sutured the perforated hole in the sigmoid colon and performed ileostomy (Fig. 1).
case_images: 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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case_images: fig0010
case_images: Histopathology showed features of malignant melanoma (Fig. 2).
case_images: 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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case_images: PMC7519280_01_gr3.jpg
case_images: fig0015
case_images: 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).
case_images: 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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case_images: PMC7519280_01_gr4.jpg
case_images: fig0020
case_images: Histopathological results were benign pigmented tumors (Fig. 4).