MRI
Well-defined mildly expansile eccentric lesion involving the distal metaphysis of left tibia with epiphyseal extension, measuring about 47 x 35 x 28 mm. The lesion is of low signal intensity on T1, high signal intensity on T2-weighted images in comparison to the marrow signal, has peripheral sclerotic margin and shows enhancement on the post-contrast study. Perilesional bone marrow edema, disruption of the distal cortical margin associated with periosteal elevation and small subperiosteal fluid collection are also noted. No hemorrhage or fluid-fluid level are seen. Articular surface of the tibiotalar joint is intact.