19-year-old male with knee pain and popping after soccer injury 4 days ago. MENISCI: The medial and lateral menisci are intact without evidence of tear.ARTICULAR CARTILAGE AND BONE: Tricompartmental articular cartilage is intact. Bone contusions are noted in the lateral femoral condyle and posterior tibial plateau.LIGAMENTS: The anterior cruciate ligament is poorly defined and edematous, compatible with an acute tear. The posterior cruciate ligament is intact. The collateral ligaments are intact. EXTENSOR MECHANISM: No significant abnormality noted.ADDITIONAL
1.Anterior cruciate ligament tear without evidence of meniscal injury.2.Large joint effusion with decompression into a Baker's cyst.