Fig. 2
Preoperative MRI findings of the right knee. Axial (a), coronal (b), and sagittal (c) T2-weighted MRIs are shown. There were multifocal intraosseous lesions (arrows, 6.1 × 2 × 2 cm sized) at metaphysis and diaphysis of the distal femur. There was no destruction of cortical bone. However, double periosteal line, which suggesting periosteal reaction (arrow head, a and b), and marrow edema were found in the surrounding tissues (asterisk, b)