Reason: assess for medial meniscus tear History: medial knee pain. MENISCI: Increased signal intensity within the inner one third of the posterior horn of the medial meniscus is compatible with a partial thickness radial tear. There is also blunting of the body of the medial meniscus suggestive of an additional partial thickness radial tear. Low signal intensity extending inferiorly from the periphery of the body of the medial meniscus along the lip of the medial tibial plateau may represent a displaced meniscal flap fragment or thickening of the coronary ligament. The anterior horn of the medial meniscus is intact.Mild intrasubstance signal intensity within the lateral meniscus suggests mild degeneration, but we see no discrete tear.ARTICULAR CARTILAGE AND BONE: There is edema within the medial femoral condyle concentrated along the medial aspect of the subarticular bone. Within this edema, just above the body of the medial meniscus, is a small curvilinear focus of subchondral low signal intensity, which could conceivably represent a small stress fracture, but this location is atypical. Mild increased signal intensity within the articular cartilage of the medial femoral condyle more laterally suggests mild degeneration. There is also relatively mild edema within the medial tibial plateau.The lateral compartment articular cartilage is intact.There is mild to moderate diffuse thinning and degeneration of the articular cartilage of the patella. There is mild heterogeneity within the articular cartilage of the lateral facet of the trochlea inferiorly, indicating mild degeneration as well.LIGAMENTS: The anterior cruciate ligament and posterior cruciate ligament are intact. There is mild edema along the medial collateral ligament which could reflect a sprain in the correct clinical setting, but the superficial fibers of the medial collateral ligament otherwise appear intact. The lateral collateral ligament complex is intact.EXTENSOR MECHANISM: The quadriceps and patellar tendons are intact. There is mild edema along the medial retinaculum structures, nonspecific.ADDITIONAL
1.Radial tears of the medial meniscus as described above with possible displaced meniscal tissue in the medial gutter.2.Edema within the medial femoral condyle associated with a curvilinear subchondral focus of low signal intensity that could represent a stress fracture albeit in a peculiar location. Alternatively, it could represent a precursor to a degenerative cyst or small focus of AVN.3.Articular cartilage degeneration as described above.4.Baker's cyst and nonspecific soft tissue edema as described above.