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Histopathological photomicrographs. a Photomicrography of the mass revealing small cells with little cytoplasm. Alveolar-type spaces are present containing desquamated small, round, and poorly differentiated skeletal muscle cells (hematoxylin and eosin, ×40). b Photomicrograph of immunohistochemical evaluation of the primary mass showing diffusely positive staining for myogenin (×20).
