Table 4 Findings of magnetic resonance imaging
Variable (No. [%]) | GNB (n = 17) | GPC (n = 37) | p |
|---|---|---|---|
Back muscle abscess | 6 (35) | 11 (30) | 0.683 |
Epidural abscess | 7 (41) | 27 (73) | 0.024* |
Patient number in lumbar region | n = 15 | n = 30 |  |
 Psoas muscle abscess | 12 (80) | 21 (70) | 0.755 |
  Single involvement | 3 (25) | 6 (29) |  |
  Bilateral involvement | 9 (75) | 15 (71) |  |