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Results of the histopathological examination. A: The cell that had a kind of circular nucleus from a uniform circle in stained acidophilic cytoplasm forms a strand from a vacuole nest and multiplies (hematoxylin-eosin stain [HE], ×200). B: A part of the same type of cell became spindle-shaped and complex (HE, ×200). C–E: The immunohistochemical stain is positive for smooth muscle actin (C), HMB45 (D), and MelanA (E).
