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(A–C) A skin biopsy showed a dermal and subcutaneous infiltrate of hyperchromatic round cells (A, H&E). In some areas, the tumor cells line the thin fibrovascular septa and form aggregates within the intervening spaces, typical of the alveolar pattern of rhabdomyosarcoma (B, H&E). The diagnosis is confirmed by a strong nuclear positivity for myogenin (C, myogenin immunohistochemistry).
