63 year old male with medial sided left knee pain. MENISCI: There is attenuation of the body and most of the posterior horn of the medial meniscus presumably reflecting changes related to the patient's history of partial meniscectomy. Best seen on coronal image 22 of series 1001, is linear increased signal intensity within the body of the medial meniscus extending to the tibial articular surface, suspicious for a tear. There is also globular increased signal intensity more anteriorly within the body of the medial meniscus that extends to the tibial articular surface, suggestive of degenerative tearing/fraying. Please note, however, it is difficult to determine whether or not these represent tears that existed prior to the patient's surgery without prior imaging for comparison. There is also diffuse signal abnormality within the remainder of the truncated posterior horn with extension to the femoral and tibial articular surfaces. Once again we cannot determine if this represents new or pre-existing tearing, but we see no fluid signal intensity within this portion of the posterior horn to indicate a large unstable tear. Finally, there is a relatively abrupt contour change between the truncated posterior horn and the remainder of the posterior horn near its root, as seen on images 21 and 22 of series 601. While we suspect this is postoperative in etiology , we cannot exclude a tear. There is mild medial extrusion of the body of the medial meniscus. There are parameniscal cysts seen along the posterior aspect of the meniscal body. The anterior horn of the medial meniscus appears intact. The lateral meniscus appears intact.ARTICULAR CARTILAGE AND BONE: There is moderate diffuse degeneration of the articular cartilage of the weightbearing portion of the medial femoral condyle with several superimposed small near full-thickness and full-thickness articular cartilage defects. There is also mild to moderate thinning of the articular cartilage of the medial aspect of the tibial plateau. There is a subchondral cyst situated centrally and inferiorly within the femoral trochlea with associated near full-thickness degeneration of the overlying articular cartilage. Articular cartilage of the patella appears intact.LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Abnormalities of the medial meniscus as described above in large part likely reflect postoperative changes, however, there is signal abnormality within the body of the meniscus that extends to the tibial articular surface which is suspicious for tearing. Other findings as described above.2. Degeneration of the articular cartilage of the medial compartment and femoral trochlea.3. Subcutaneous mass along the lateral aspect of the distal thigh that is incompletely imaged on this study and could be further evaluated with a contrast-enhanced MRI.