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Tumor histology of the resected tumor. The surgically resected intramuscular tumor macroscopically showed a necrotic area with cystic change in the center of the tumor (A). Histologically, the surgically resected tumor was composed of an admixture of myxoid and fibrous areas (B). A whorled growth pattern with bland spindle-shaped tumor cells was observed (C). Massive hemorrhagic necrosis was observed at the center of the tumor (D).
