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Fig. 1C. —38-year-old man with acute atraumatic knee pain of 48-hr duration that feels worse at night and provisional clinical diagnosis of lateral collateral ligament (LCL) tear, lateral meniscus tear, or fracture. Axial contrast-enhanced T1-weighted fat-saturated MR image (780/14) shows LCL thickening and calcification (arrow). Popliteal recess and tendon are normal.