56-year-old male with tenderness to palpation along the left medial knee and a positive McMurray's test. MENISCI: There is linear, horizontally-oriented increased signal intensity within the posterior horn of the medial meniscus that extends through the posteromedial peripheral fibers of the meniscus decompressing into a 2 cm parameniscal cyst located deep to the tibial collateral ligament. This tear may extend to the tibial and femoral articular surfaces, however this is equivocal. There is also slight blunting of the free edge of the body of the medial meniscus suggestive of fraying. There is slight medial extrusion of the body of the medial meniscus. The anterior horn of the medial meniscus appears normal. The lateral meniscus is normal.ARTICULAR CARTILAGE AND BONE: Subjectively, the articular cartilage of the medial compartment appears slightly thinned with possible focal full thickness degeneration along the medial femoral condyle just above the free edge of the body of the meniscus. There is heterogeneity of the articular cartilage of the patella and femoral trochlea indicating mild to moderate degeneration, particularly along the trochlea where there are small subchondral cysts.LIGAMENTS: The anterior cruciate ligament appears intact. There is a 1 cm ovoid focus of low signal intensity along the anterior fibers of the ligament which may represent focal arthrofibrosis. The posterior cruciate ligament is intact. The MCL and LCL are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1. Horizontal tear of the medial meniscus extending through the peripheral fibers and decompressing into a parameniscal cyst.2. Cartilage degeneration and other findings as described above.