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A 59-year-old AAIHP. Axial PD-weighted MRI image with fat suppression, showing a fluid-filled FCL-popliteus bursa (white solid arrow), popliteus bursa (white dashed arrow), medial gastrocnemius bursa (black solid arrow), and popliteal bursa (black dashed arrow) surrounding the left knee. PD: Proton density; AAIHP: Asymptomatic amateur ice hockey players; MRI: Magnetic resonance imaging; FCL: Fibular collateral ligament; PD: Proton density.
