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Joint effusion and reactive synovial proliferation in the suprapatellar recess.
A high-grade radial tear of the posterior horn of the medial meniscus, with almost 'ghost' appearance, extending to the posterior root. The meniscal body is extruded, pushing the medial collateral ligament. Accompanying extensive full-thickness chondral loss and subchondral changes in the medial joint compartment, in keeping with grade 4 Outerbridge chondral injury.
Lateral discoid meniscus with no posttraumatic lesions.