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Table 2 Distribution of prevalent cysts according to baseline severity of effusion and synovitis

From: Longitudinal assessment of cyst-like lesions of the knee and their relation to radiographic osteoarthritis and MRI-detected effusion and synovitis in patients with knee pain

Type of lesion WORMS grade
  0 1 2 3
Effusion N = 179 N = 80 N = 50 N = 10
   Popliteal cyst 74 (41) 34 (43) 15 (30) 5 (50)
   Subgastrocnemius bursitis* 20 (11) 16 (20) 8 (16) 5 (50)
   Proximal tibiofemoral joint cyst 13 (7) 7 (9) 4 (8) 2 (20)
Synovitis N = 121 N = 128 N = 61 N = 9
   Popliteal cyst 41 (33) 59 (46) 25 (41) 3 (33)
   Subgastrocnemius bursitis** 11 (9) 21 (16) 15 (25) 2 (22)
   Proximal tibiofemoral joint cyst 8 (7) 12 (9) 4 (7) 2 (22)
  1. Data presented as number of each type of lesion (percentage). WORMS, Whole Organ Magnetic Resonance Imaging Score; N, number of knees that belong to each WORMS grade. Significant increasing trend observed in subgastrocnemius bursitis: *P = 0.0072, **P = 0.0060.