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Fig. 3. —37-year-old man with pathologic diagnosis of periosteal chondrosarcoma. Axial T2-weighted fat-suppressed fast spin-echo MR image (TR/TE 3800/80, echo train length, 8) of left tibia shows 4-cm high-signal-intensity mass based on posterior periosteal surface of proximal tibial metaphysis (T) with bone marrow invasion (arrow), irregular peripheral margins, and extensive soft-tissue edema.