37-year-old male with history of left knee pain. Evaluate for meniscal tear. MENISCI: Globular and linear signal abnormality throughout much of the lateral meniscus indicates intrasubstance degeneration. Within the anterior horn of the lateral meniscus, there is linear signal intensity which contacts the tibial articular surface indicating an undersurface tear. Loculated foci of near-fluid signal intensity near the lateral margin of the lateral meniscus likely represents perimeniscal cyst formation.The medial meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is focal near-full thickness to full-thickness articular cartilage loss of the femoral trochlea centrally and inferiorly. There is minimal subjective thinning of the remainder of the articular cartilage.LIGAMENTS: The ACL, PCL, MCL, and LCL are intact. EXTENSOR MECHANISM: The extensor mechanism is unremarkable.ADDITIONAL
Intrasubstance degeneration and undersurface tearing of the lateral meniscus as above.1.Focal degeneration of the articular cartilage of the femoral trochlea.2.Small joint effusion.