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A and B: Histopathology: macular papule showed tumor cells arranged as nests in dermo-epidermal junction and dermis, and no obvious melanin was observed; C and D: histopathology: left inguinal lymph nodes revealed dense infiltration of tumor cells with rich melanin granules in cytoplasm (hematoxylin & eosin, A, x40; B, x200 ; C, x40 ; D, x200)
