Reason: ACL or meniscal injury? History: pain behind knee and inability to bear weight after basketball injury MENISCI: There is a 3 mm focus of fluid signal intensity within the anterior horn of the lateral meniscus, near its root, consistent with parameniscal cyst formation, indicating a small tear, likely longitudinal (image 12; series 7). The posterior horn of lateral meniscus appears intact. The medial meniscus appears intact.ARTICULAR CARTILAGE AND BONE: No full-thickness or near full-thickness articular cartilage defects are identified. No bone marrow signal abnormality is seen. There is subjective thinning of the articular cartilage along the patellofemoral articulation.LIGAMENTS: The cruciate and collateral ligaments appear intact EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Parameniscal cyst within the anterior horn of the lateral meniscus, near its root, indicating a tear.2. Elevated tibial tubercle to trochlear groove distance, which can be seen in patellofemoral instability.