Large joint effusion with evidence of chronic synovitis.
Heterogeneous mass within the anterolateral aspect of the knee joint.
No Baker's cyst. Menisci are intact. No parameniscal cyst. Cruciate and collateral ligaments are intact. Posterolateral corner structures are normal.
Lateral patellar subluxation. Marked hyperintensity of the superolateral aspect of Hoffa's fat pad. Partial and full thickness medial and lateral patellar facet chondral fissuring with subchondral oedema.