What is multilevel spondylitis?

What is Multilevel Spondylitis?

Multilevel spondylitis refers to an infectious or inflammatory process affecting multiple, often non-contiguous (non-adjacent) levels of the spine simultaneously, involving the vertebral bodies, intervertebral discs, and surrounding structures.

Definition and Clinical Context

Multilevel spondylitis represents a more extensive and complex form of spinal infection or inflammation that spans multiple vertebral segments. This pattern can occur in two main contexts:

Infectious Spondylitis (Spondylodiscitis)

• Involves infection of vertebral bodies, intervertebral disc spaces, and paraspinal tissues across multiple spinal levels 1
• Can present as contiguous (adjacent levels) or non-contiguous (skip lesions) involvement
• Most commonly caused by pyogenic bacteria, but tuberculous spondylitis is a notable cause of multilevel disease 2, 3

Key Clinical Scenarios

Tuberculous Spondylitis (Pott's Disease):

• Particularly prone to multilevel, non-contiguous involvement 2, 3
• Can affect cervical, thoracic, lumbar, and sacral segments simultaneously
• May present with caseous material, fistula formation, and severe systemic compromise 2
• Example: A documented case showed four non-contiguous osteolytic lesions affecting T10/11, L1/2, L3/4, and L5/S1 3

Pyogenic Multilevel Spondylodiscitis:

• Less common than single-level disease but carries higher morbidity 4
• Can occur even in previously healthy individuals
• May present with negative microbiological cultures despite clear imaging findings 4

When to Suspect Multilevel Involvement

Image the entire spine when patients have: 1

• History of IV drug use
• Tuberculosis or endemic infections (brucella)
• Initial imaging showing involvement at one level (to rule out additional sites)
• Severe systemic symptoms or immunosuppression

Diagnostic Approach

MRI of the entire spine is the gold standard 1:

• Sensitivity: 96%, Specificity: 94%, Accuracy: 92% for spine infection 1
• Perform with and without IV contrast using T1-weighted, T2-weighted with fat suppression or STIR sequences 1
• Contrast enhancement is essential to define extent of infectious process and identify epidural abscesses 1
• Shows marrow edema, disc space abnormalities, paraspinal collections, and epidural involvement 1

Critical Pitfall: Initial radiographs lag behind clinical symptoms by 2-8 weeks and may miss early multilevel disease 1. Do not rely on plain films alone when clinical suspicion is high.

Clinical Implications

Multilevel involvement indicates:

• More severe disease burden
• Higher risk of spinal instability across multiple segments
• Potential for epidural abscess formation with cord compression
• Need for more extensive surgical planning if intervention required 2
• Longer treatment duration and more complex follow-up

Red flags requiring urgent evaluation: 1

• Diabetes mellitus
• IV drug use
• Cancer or HIV
• Dialysis
• Elevated ESR/CRP
• Fever with back/neck pain

Treatment Considerations

Management depends on etiology but generally requires:

• Microbiological confirmation via image-guided biopsy when possible 1
• Prolonged antimicrobial therapy (anti-tuberculous drugs for TB, antibiotics for pyogenic) 3, 4
• Surgical intervention for instability, cord compression, or neurological deficit 2
• Staged surgical procedures may be necessary for multiple non-contiguous levels 2

Important caveat: Conservative medical management can be successful even in multilevel disease if there is no mechanical instability or neurological compromise 3.