48-year-old female with pain in the left knee The images are suboptimal secondary to patient body habitus.MENISCI: There is blunting of the posterior horn of the medial meniscus consistent with a tear. The posterior horn of the medial meniscus is also abnormally small and approximately the size of the anterior horn. There is perhaps mild extrusion of disc material medially but there is no fluid between the meniscus and the medial lateral ligament.ARTICULAR CARTILAGE AND BONE: There is marked thinning of the hyalin cartilage involving the medial femoral condyle and this is likely the cause of the adjacent abnormal bone marrow signal in the distal posterior medial femur and proximal posterior medial tibial plateau. Within the posterior medial tibial plateau is a little focus of decreased T1 and increased T2 signal abnormality with a raspberry configuration and which most likely represents a benign endochondroma. There is also uniform narrowing of the patellar cartilage but no focal defects.LIGAMENTS: There is mild increased signal involving the medial collateral ligament which may indicate a mild strain. The remaining cruciate and collateral ligaments are intact.EXTENSOR MECHANISM: The extensor mechanism is intact. A Baker's cyst is incidentally noted. There is mild increased T2 signal abnormality in stranding involving the soft tissues adjacent to the medial compartment.ADDITIONAL
1.Tear of the posterior horn of the medial meniscus.2.Marked thinning of the posterior medial tibial and femoral surface articular cartilage with adjacent bone marrow signal changes.3.Mild increased signal involving the medial collateral ligament indicating possible mild medial collateral ligament strain.4.Uniform narrowing of the patellofemoral cartilage but no focal defects.