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Histopathological findings of the nodule obtained from left gluteal muscle. (A) Low-power (left) and high-power (right) images of a hematoxylin and eosin-stained section showing the tumor comprised only of spindle-shaped malignant cells with clustered necrotic regions (white arrow) and invasion to skeletal muscles (black arrow). (B) Immunohistochemical analysis showing diffuse cytokeratin AE1/AE3 (left) and vimentin (right) positivity.
