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)

*The difference is significant (p < 0.05)