Upper Neck Pain and Stiffness in Behçet's Disease: Key Differential Diagnoses
In a patient with Behçet's disease presenting with upper neck pain and stiffness, you must urgently evaluate for life-threatening vascular complications—specifically brachiocephalic artery stenosis, aneurysm, or occlusion—as well as neurological involvement including cervical spinal cord lesions and dural sinus thrombosis, while also considering the more common but less dangerous arthritis and atlanto-axial subluxation.
Critical Life-Threatening Causes to Rule Out First
Vascular Involvement (One-Third of Behçet's Patients)
Any artery or vein can be affected by the vasculitic process in Behçet's disease 1. The upper neck region is particularly vulnerable due to:
Brachiocephalic artery involvement: Stenosis, aneurysm formation, or occlusion can occur with or without aortic involvement 1. These lesions can cause neck pain and are potentially fatal if rupture occurs 1.
Cerebral sinus thrombosis: Deep vein thrombosis can occur in cerebral sinuses 1, causing severe headache, neck stiffness, and neurological symptoms. For dural sinus thrombosis, corticosteroids are the recommended treatment 2.
Common pitfall: Aneurysm rupture in Behçet's is unpredictable and can be fatal 1. Do not delay vascular imaging if clinical suspicion exists.
Neurological Involvement (Neuro-Behçet)
Cervical spinal cord lesions: While spinal involvement occurs in only 10-18% of neuro-Behçet cases, isolated cervical spine lesions have been documented 3. A recent case demonstrated a right laterobulbar lesion presenting with posterior cervical pain, ptosis, hemiparesis, and dysmetria 4.
Brainstem involvement: Can present with neck pain alongside cranial nerve deficits and ataxia 4.
Treatment approach: Methylprednisolone pulses followed by azathioprine showed progressive improvement and imagological resolution in documented cases 4. For parenchymal CNS involvement, agents to try include corticosteroids, interferon-α, azathioprine, cyclophosphamide, methotrexate, and TNF-α antagonists 2.
Non-Life-Threatening but Important Causes
Arthritis (Most Common MSK Manifestation)
Arthritis in Behçet's typically follows a mild, transient course without deformities or erosions 2. However, recent data shows that 85.4% of Behçet's patients report musculoskeletal manifestations, with the neck affected in 67% of cases 5. The neck was the second most commonly affected area after the lower back (69%) 5.
- First-line treatment: Colchicine 1-2 mg/day is usually effective and should be the initial approach 2.
- Impact: Patients with MSK manifestations demonstrate significantly lower quality of life scores across all SF-36 domains 5.
Atlanto-Axial Subluxation (Rare but Documented)
Progressive atlanto-axial subluxation has been reported in Behçet's disease 6. In the documented case, posterior neck pain began 10 years after diagnosis, with initial radiographs showing no abnormality but follow-up films 6 months later demonstrating subluxation 6. This represents only the second reported case worldwide 6.
Coexisting Ankylosing Spondylitis
Clinically occult ankylosing spondylitis can coexist with Behçet's disease 7. One case demonstrated low back pain and cervical/lumbar spine stiffness, with AS diagnosis revealed after 16 years of known Behçet's disease 7. Both conditions share HLA associations and inflammatory characteristics 1.
Diagnostic Algorithm
Immediate vascular imaging (CT angiography or MR angiography) to exclude:
- Brachiocephalic artery stenosis/aneurysm/occlusion
- Cerebral sinus thrombosis
Neurological assessment with MRI brain and cervical spine if any neurological signs present to exclude:
- Cervical spinal cord lesions
- Brainstem involvement
If vascular and neurological causes excluded, obtain:
- Cervical spine radiographs (flexion/extension views) for atlanto-axial instability
- Inflammatory markers (ESR, CRP)
- Consider HLA-B27 testing if spondyloarthropathy suspected
Clinical examination for:
- Range of motion limitations
- Inflammatory vs. mechanical pain pattern
- Associated systemic symptoms
Treatment Priorities Based on Etiology
Vascular involvement: Systemic corticosteroids are typical therapy; immunosuppressives (cyclophosphamide + corticosteroids for arterial aneurysms) 1, 2.
Neurological involvement: Corticosteroids ± azathioprine, cyclophosphamide, or TNF-α antagonists 2, 4.
Arthritis: Colchicine as first-line 2.
Atlanto-axial subluxation: Requires orthopedic/neurosurgical consultation for potential stabilization.
Critical caveat: The presence of neck pain in Behçet's disease warrants urgent evaluation because delayed recognition of vascular or neurological involvement can result in irreversible damage or death, whereas arthritis—though common—poses minimal mortality risk but significantly impacts quality of life 5.