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Axial CT of the left knee at the level of the tibial plateau demonstrates a posteriorly oriented lateral tibial plateau cortically based subcentimeter lucency with internal nidus of mineralization consistent with osteoid osteoma (orange circle). Anterior to the osteoid osteoma is a geographic region of hyperdensity with ill-defined margins consistent with cement material from the prior lateral tibial plateau subchondroplasty.
