52-year-old female with right knee pain and effusion MENISCI: There is disruption of the posterior horn of the medial meniscus at its root with slight medial extrusion of the body of the medial meniscus. Globular increased signal within the posterior horn and body of the medial meniscus indicates intrasubstance degeneration. The lateral meniscus is intact.ARTICULAR CARTILAGE AND BONE: There is edema within the medial aspect of the medial tibial plateau, perhaps related to the overlying extruded meniscus. There is focal thinning of the articular cartilage along the superior aspect of the patella along the median eminence with underlying edema in the subchondral bone. Blistering of the articular cartilage is seen more inferiorly.LIGAMENTS: There is mild edema along the superficial band of the MCL which could represent a sprain in the correct clinical setting, but can also be seen in the setting of medial meniscal injury. The MCL itself is intact. The lateral collateral ligament complex is intact. The ACL and PCL are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Root avulsion of the posterior horn of the medial meniscus.2.Degeneration of the articular cartilage of the patella as described above.3.Mild edema surrounding the MCL could represent a sprain in the correct clinical setting, but can also be seen in the setting of medial meniscal injury. The MCL itself is intact.4.Small joint effusion.5.Baker's cyst with findings suggesting leakage/rupture.6.Other findings as described above.