Table 1. Demographic and clinical characteristics of the patients.

Characteristics	Value
Number of patients	45
Age (yrs.)	35.4 (range 17–62)
Male to female ratio	29: 16
History of tuberculosis infection	11
Paravertebral cold abscess	37
Retropharyngeal abscess	4
Erythrocyte sedimentation rate (mm/h)	67.8 (range 28–115)
C-reactive protein (mmol/l)	18.7 (range 10.6–55)
Associated with neurological damage	38
Patient classification (segments)
Group A	19 (C7/T1 in 8, T1 in 11)
Group B	13 (T1/T2 in 7, T2 in 6)
Group C	13 (T2/T3 in 8, T3 in 5)