14-year-old male with history of knee pain with swelling and instability. Evaluate for ACL tear. MENISCI: The lateral and medial menisci are intact.ARTICULAR CARTILAGE AND BONE: There is increased edema type signal abnormality within the anterior aspect of the tibial epiphysis. There is 6 mm of broad based cortical depression about the anterior aspect of the lateral tibial plateau. There is also edema type signal abnormality within the femoral epiphysis, medial greater than lateral.There is periosteal reaction noted about the lateral aspect of the distal femur with a small amount of subperiosteal increased T1/T2 signal abnormality. Within the posterolateral femoral physis there is a focus of increased signal intensity (best seen on image 8 of series 1001 and image 15 of series 901).LIGAMENTS: There is increased signal abnormality and thickening of the ACL, although the fibers are intact. There is intermediate signal intensity involving the lateral collateral ligament complex with a small amount of adjacent fluid. The PCL and MCL are intact.EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1. 6 mm broad base depression of the anterior aspect of the lateral tibial plateau with underlying diffuse bone marrow edema involving the anterior aspect of the tibial epiphysis.2. Small fracture within the posterolateral distal femoral physis with hematoma extending cranially resulting in a small subperiosteal hematoma and subsequent periostitis.3. Partial ACL tear.4. Mild sprain of the LCL. 5. Bone marrow edema about the femoral epiphysis.