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Ewing sarcoma of the lumbar spine in a 17-year-old boy. A, Post-contrast-enhanced axial CT image demonstrates a large partially calcified mass in the paraspinal musculature at the L3–L5 levels. The mass involves the adjacent spinous process and extends into the spinal canal. B, Axial T1-weighted postgadolinium MR image shows extensive enhancement of the mass with epidural extension.
