23-year-old male with right knee lateral joint line pain. MENISCI: Linear signal abnormality extends from the free edge of the body of the lateral meniscus through the peripheral fibers decompressing into a lobulated, slightly heterogeneous perimeniscal cyst. The configuration of the signal abnormality suggests a radial tear centrally that propagates as a horizontal tear peripherally. The anterior and posterior horns of the lateral meniscus appear normal. We see no tear of the medial meniscus.ARTICULAR CARTILAGE AND BONE: Articular cartilage and bone appear normal.LIGAMENTS: There is lateral bowing of the lateral collateral ligament due to the underlying perimeniscal cyst, but we see no ligament tear. EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
Lateral meniscal tear with perimeniscal cyst.