19-year-old male with knee pain and slight effusion after falling on left knee. MENISCI: There is intrasubstance signal within the posterior horn of the medial meniscus that may reflect prominent vascularity or degeneration, but we see no tear. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: The articular cartilage and bone marrow signal appears normal.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. No evidence of patellar chondral injury or PCL injury. No frank joint effusion.2. Elongated collection of fluid signal intensity within the popliteus muscle likely representing a ganglion of questionable clinical significance.