History:
36 months old with right thigh swelling.
Findings:
The x-ray shows swelling lateral to the right femur with no evidence of bone disruption, infiltration or lytic changes.
The MRI shows large well-defined lobulated soft tissue mass noted arising from the lateral femoral compartmental muscles. It shows a well-defined capsule and central necrosis. The lesion is isointense to muscle in T1 weighted images and high in T2 weighted images with heterogeneous enhancement. The adjacent femoral vessels are compressed by the mass.
Diagnosis:
Rhabdomyosarcoma
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