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Fig. 2A. —16-year-old girl with metastatic Ewing's sarcoma of pelvis, shown after chemotherapy. Coronal T1-weighted fat-suppressed MR image obtained with gadopentetate dimeglumine shows large enhancing mass (curved arrow) with heterogeneous signal intensity in region of left iliac wing. In addition, enhancement of surrounding gluteus and iliopsoas muscles (straight arrow) can be seen. Findings are suggestive of either residual or new tumor. Areas in muscles that showed no enhancement are suggestive of tumor necrosis.