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Histopathological findings. A: Tumor consisted of malignant epithelial tumor cells and spindle cells with large amounts of acidophilic cytoplasm and prominent nucleoli (HE, original magnification ×200). B: Immunohistochemical staining for HMB-45 is positive (Original magnification ×200). C: Immunohistochemical staining for M-A is positive (Original magnification ×200). D: Immunohistochemical staining for S-100 is positive (Original magnification ×200).
