20-year-old male with pain. MENISCI: The medial and lateral meniscus appear intact.ARTICULAR CARTILAGE AND BONE: There is increased bone marrow signal abnormality within the lateral tibial plateau and lateral femoral condyle. No full-thickness or near full-thickness articular cartilage defects are identified.LIGAMENTS: Multiple lobulated foci of fluid signal abnormality along the posterior aspect of the proximal fibers of the ACL may represent ganglion formation versus mucoid degeneration. There is partial thickness tearing of the MCL.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Near full thickness tearing of the MCL with associated bone contusions affecting the lateral tibial plateau and lateral femoral condyle.2. Multiple lobulated foci of fluid signal abnormality along the posterior aspect of the proximal fibers of the ACL may represent ganglion formation. 3. Small joint effusion.