65 yo with long history of knee pain. Prior trauma. Prior surgery.
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The subcutaneous medial mass was a flap of medial gastrocnemius muscle to fill in a defect from a soft tissue injury. The surgery was years ago. Streaks of fat within the mass is a clue as is the fatty atrophic change in the near midline sagittal proton density image.
gastrocnemius muscle flap for soft tissue injury ( RID2920 )