MRI findings and classification of brucella spondylitis: a China multicenter study.

Objectives: To propose a magnetic resonance imaging (MRI) classification of brucellosis spondylitis (BS) to determine a standard treatment method and a standard of post-treatment MRI follow-up.

Methods: This is a multicenter retrospective cohort study. All patients diagnosed with BS at six hospitals for 12 years, were included in the study. Data were collected retrospectively from the medical records of the patients. The classification of the cases was based on MRI. We analyzed MRI features of BS was categorized them into three types.

Results: Six hundred fifteen patients were included in the study, 78.9% of whom were males. The mean age was 53.05 ± 11.06 years. Involvement of single vertebrae occurred in 6.2% of patients, while 72.7% involved two vertebrae and 21.1% involvement of more than two vertebrae. The most common of the lumbar spine was 64.6%. The main findings of MRI were affected vertebral endplate 2/3 above (60.7%), intervertebral space narrow (77.9%), intervertebral disc involvement (83.6%), paravertebral abscess (50.9%), disc abscess (49.6%), epidural abscess (43.3%), vertebra height change (22.1%), psoas abscess (22.0%), and abnormal vertebral accessory (10.2%). MR imaging of BS was categorized into three types. Type I: 57 (9.3%) patients; Type II: 526 (85.5%) patients, including IIa (26.5%), IIb (36.9%), and IIc (22.1%); Type IV: vertebral appendage type, 63 (10.2%) cases; Type III: 32 (5.2%) patients.

Conclusions: MRI features of multicenter data can provide theoretical support for diagnosing BS. MRI classification of BS can afford better help for clinical treatment and follow-up after clinical treatment.