48 year-old woman with history of pain and stiffness. MENISCI: There is a complex tear of the anterior horn of the lateral meniscus, predominantly horizontal with additional linear signal abnormality extending superiorly towards the femoral articular surface. Additionally, there is lateral extrusion of the anterior horn of the lateral meniscus and a moderate amount of parameniscal fluid. The medial meniscus and posterior horn of the lateral meniscus are intact.ARTICULAR CARTILAGE AND BONE: The articular cartilage of the tibiofemoral compartment is uniformly thin but intact. The patellofemoral compartment articular cartilage appears normal. Bone marrow signal appears normal.LIGAMENTS: The ACL, PCL, MCL, and LCL complex are intact. EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
Torn anterior horn of the lateral meniscus with lateral extrusion.