Figure 3a. Lytic pattern with well-defined margins. (a) Lateral radiograph of a 77-year-old woman shows a large but fairly well-defined lytic lesion (arrows) of the proximal tibia that appears to extend superiorly into the tibial plateau. (b) Sagittal T2-weighted image (3,030/70) shows that the lesion is confined within the marrow but extends superiorly into the anterior aspect of the proximal tibia (arrowheads). No soft-tissue mass is seen.