Reason: possible right lateral meniscal tear vs other internal derangement History: instability MENISCI: There is undulation of the free edge of the body of the medial meniscus likely representing meniscal flounce. There is no fluid-filled or unstable tear. There is minimal globular intrasubstance degeneration within the posterior horn of the medial meniscus. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: No full-thickness or near full-thickness articular cartilage defects are identified. There is heterogeneous bone marrow which likely represents residual islands of red marrow. There is a focus of low signal intensity within the proximal fibula likely representing a benign bone island.LIGAMENTS: The cruciate and collateral ligaments appear intact. There are lobulated foci of fluid signal intensity along the posterior aspect of the PCL which may reflect mucoid degeneration or ganglion formation.EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Mild intrasubstance degeneration of the medial meniscus without evidence of a meniscal tear.2. Tiny Baker's cyst.