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Figure 7. (a) (Case 7) Lateral radiograph of the knee joint shows an expansile lytic lesion in the distal shaft of the femur with a sclerotic rim. (b) (Case 7) Sagittal T2 weighted image shows a heterogeneous lesion, which is mostly isointense with some hyperintense areas and curvilinear hypointensities representing septations. The central portion of the lesion is more hyperintense compared with the more peripheral portion. (c) (Case 7) Sagittal contrast-enhanced fat-suppressed T1 weighted image shows central enhancement at the site of the hyperintense signal on the T2 weighted image. The peripheral areas that are T2 isointense may represent non or minimally enhancing fibrous tissue.
