Figure 7b. Mixed lytic-sclerotic pattern. (a) Frontal radiograph of a 24-year-old woman shows a predominantly sclerotic appearance of the distal femur with a few lytic areas. (b) Coronal STIR image (4,800/30; flip angle, 180°) reveals increased signal intensity primarily involving the medial condyle. Although cortical erosion is seen (arrow), there is no indication of a definite soft-tissue mass. (c, d) Axial T1-weighted images (800/12; flip angle 180°) obtained before (c) and after (d) the administration of contrast material reveal enhancement of the lesion in the medial femoral condyle.