Reason: r/o meniscal tear History: chronic knee pain. MENISCI: There is globular increased signal abnormality within the posterior horn of the medial meniscus indicating intrasubstance degeneration. Some of this signal extends to the tibial articular surface indicating a degenerative horizontal tear. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is near full-thickness to full-thickness articular cartilage degeneration along the lateral femoral condyle, anteriorly. There is full-thickness articular cartilage degeneration along the lateral facet of the femoral trochlea with underlying subchondral signal abnormality. There is partial-thickness articular cartilage degeneration along the lateral facet of the patella. There is a 1.2 cm focus of decreased signal abnormality along the anterior aspect of the lateral femoral condyle likely representing a loose body within the joint. Heterogeneous bone marrow signal abnormality is nonspecific but may reflect residual islands of red marrow.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Intrasubstance degeneration and degenerative tearing of the medial meniscus.2. Osteoarthritis of the knee including near full-thickness to full-thickness articular cartilage degeneration most pronounced along the lateral tibiofemoral and patellofemoral compartments.3. Moderate size joint effusion extending posteromedially into a Baker's cyst.