Reason: Evaluate right knee for lateral meniscus tear, possibly chronic discoid History: right knee pain, locking MENISCI: There is abrupt attenuation of the posterior half of the body and much of the posterior horn of the lateral meniscus with only a thin rind of peripheral meniscal tissue remaining, presumably representing extensive tearing of the lateral meniscus in the absence of prior partial meniscectomy. The anterior horn of the lateral meniscus is intact.There is mild intrasubstance degeneration of the medial meniscus, but no discrete tear is identified.ARTICULAR CARTILAGE AND BONE: There is full-thickness degeneration of the articular cartilage in the lateral tibiofemoral compartment particularly along the lateral tibial plateau, posteriorly. There is also full-thickness degeneration of the articular cartilage of the lateral femoral condyle posteriorly. There is focal degenerative signal abnormality in the underlying subchondral bone.The articular cartilage within the medial tibiofemoral and patellofemoral compartments is intact.LIGAMENTS: The anterior cruciate ligament is not visualized, presumably representing a chronic tear. The posterior cruciate ligament is intact. The medial collateral ligament and lateral collateral ligament complex are intact. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1.Marked attenuation of the posterior horn and body of the lateral meniscus presumably representing extensive tearing in the absence of prior meniscectomy.2.Articular cartilage loss of the lateral tibiofemoral compartment as described above.3.Chronic tear of the anterior cruciate ligament.