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Fig. 1A. —10-year-old boy with history of clear cell sarcoma of right foot, shown after amputation of fourth and fifth rays and radiation therapy. Sagittal fat-suppressed T1-weighted MR image obtained with gadopentetate dimeglumine shows patchy increased signal intensity and enhancement in tarsal and metatarsal bones (black arrows). In addition, diffuse increased signal intensity and enhancement in muscles and tendons along plantar surface (white arrow) are present. Findings are suggestive of tumor involvement versus changes caused by radiation therapy.