A previously asymptomatic 10-year-old girl presented to Kings County Hospital, Brooklyn, NY, with a history of a left-thigh mass. There was no history of trauma. On physical examination a tender, solid, soft-tissue mass (2.5×4.5 cm) was noted in the anterior compartment of the left thigh, 10 cm proximal to the knee. The skin over the mass was normal. The mass was immovable, and it was not clinically possible to determine its relationship to the muscle. The child had no rash, fever, or systemic complaints, and results of all routine laboratory studies were normal. T1-weighted (Fig 1) and T2-weighted (Fig 2) magnetic resonance images (MRIs) of the thighs were obtained.
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