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Figure 11. (a) Lateral radiograph of the knee in an elderly patient. A densely mineralized mass is seen posteriorly, apparently separate from bone. (b) Axial CT confirms that the mass does not arise in bone, and is diffusely mineralized, not displaying the peripheral ossification of post-traumatic myositis ossificans. (c) Sagittal T1 weighted MR image shows a densely calcified mass and a large posterior unmineralized component (arrows). The mass arises in soft tissue. Diagnosis: synovial sarcoma.
