Fig. 3. Pathological findings. (A) In the endoscopic biopsy specimens, brown-colored atypical melanocytes are observed (arrows) (hematoxylin and eosin stain [H&E], ×200). Immunohistochemical staining is positive for (B) Melan A (×200), (C) S-100 (×200), and (D) HMB45 (×200) proteins.

Korean J Gastroenterol 2022;79:222~227 https://doi.org/10.4166/kjg.2022.031

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