56-year-old female patient with medial right knee pain x 5 months. Evaluate for medial meniscus tear with subchondral cysts. MENISCI: There is marked attenuation of the body of the medial meniscus, likely representing extensive degenerative tearing. Although this could conceivably represent prior meniscectomy, we see no additional findings to support this. The attenuated meniscal body contains abnormal increased signal intensity that extends to the posterior horn and to a lesser degree the anterior horn, indicating a combination of degeneration and tearing. There is mild intrasubstance signal within the lateral meniscus, indicating mild intrasubstance degeneration, but we see no tear.ARTICULAR CARTILAGE AND BONE: There is a full-thickness fluid-filled defect in the articular cartilage of the weightbearing portion of the medial femoral condyle that measures approximately 2 cm in AP dimension and 5 mm in width. There is additional near full-thickness to full-thickness loss of the articular cartilage of the medial femoral condyle, particularly posteriorly, with numerous subchondral cysts and subchondral edema-like signal. There is also subjective thinning of the medial tibial plateau articular cartilage. There is degeneration of the articular cartilage of the lateral patellar facet with full-thickness fissuring and underlying subchondral cyst formation. There is less pronounced articular cartilage degeneration of the medial patellar facet. There is mild heterogeneity of the weightbearing portion of the lateral compartment articular cartilage, indicating focal degeneration.LIGAMENTS: There is mild edema along the superficial band of the medial collateral ligament, likely secondary to underlying meniscal/cartilage pathology, however, this could represent a sprain in the appropriate clinical context. The anterior cruciate alignment, posterior cruciate ligament, and lateral collateral ligament complex are intact.EXTENSOR MECHANISM: The extensor mechanism is intact.ADDITIONAL
1.Severe degeneration and tearing of the medial meniscus.2.Tricompartmental articular cartilage defects, particularly in the medial compartment with prominent subchondral cysts.