In a 57-year-old woman presenting with right-sided headache and right facial numbness, what is the appropriate diagnostic work-up and initial management?

Urgent Neuroimaging Required – This is NOT Migraine Until Proven Otherwise

A 57-year-old woman presenting with right-sided headache and right facial numbness requires immediate brain MRI with contrast to exclude secondary causes, particularly stroke, tumor, or other structural lesions – this presentation has multiple red flags that mandate urgent investigation before any symptomatic treatment is initiated 1.

Critical Red Flags Present

This patient has two major red flags that make secondary headache highly likely:

• Focal neurological symptoms (right facial numbness) 1
• Age >50 years at symptom onset 1

These findings indicate possible:

• Stroke or TIA (most urgent concern given unilateral facial numbness)
• Intracranial space-occupying lesion (tumor, abscess)
• Giant cell arteritis (given age >50)
• Trigeminal nerve pathology (neurosarcoidosis, schwannoma, neurovascular compression) 2, 3

Immediate Diagnostic Work-Up

First-Line Imaging

MRI brain with contrast is the preferred initial study – it offers superior resolution without radiation exposure and can identify:

• Acute ischemic stroke (diffusion-weighted imaging)
• Structural lesions affecting the trigeminal nerve pathway
• Demyelinating disease (multiple sclerosis)
• Vascular malformations 1

CT head without contrast is acceptable only if MRI is unavailable or contraindicated, but has lower sensitivity for posterior fossa lesions and early stroke 1.

Additional Urgent Testing

• ESR and CRP – mandatory given age >50 to exclude giant cell arteritis, which can cause blindness if untreated 4
• Complete neurological examination – document extent of trigeminal nerve involvement (V1, V2, V3 distributions), assess for other cranial nerve deficits, check for neck stiffness 1

Common Diagnostic Pitfalls

Do NOT diagnose this as migraine with aura despite the unilateral headache. Key differences:

• Migraine aura typically involves visual symptoms in >90% of cases, not isolated facial numbness 1
• Sensory aura in migraine spreads gradually over minutes and is transient (typically <60 minutes) 1
• Persistent facial numbness is NOT typical migraine aura – this suggests structural pathology 1

Do NOT assume bilateral mastoid opacification on imaging explains unilateral symptoms – radiologic findings must correlate anatomically and temporally with clinical presentation 5.

Initial Management Pending Imaging

Hold all migraine-specific treatments (triptans, NSAIDs) until secondary causes are excluded – treating symptomatically could mask progression of serious pathology.

If giant cell arteritis is suspected (temporal tenderness, jaw claudication, visual symptoms):

• Start high-dose corticosteroids immediately (prednisone 40-60 mg daily) without waiting for biopsy
• Arrange urgent temporal artery biopsy within 1-2 weeks 4

Differential Diagnosis Priority List

1. Stroke/TIA – most urgent, requires immediate neurovascular imaging
2. Giant cell arteritis – can cause permanent blindness
3. Trigeminal nerve lesion – tumor, neurosarcoidosis, schwannoma 2, 3
4. Trigeminal neuralgia with atypical features – but typically lacks persistent numbness 3
5. Intracranial mass – tumor, abscess, vascular malformation

When Secondary Causes Are Excluded

Only after comprehensive imaging and laboratory evaluation exclude dangerous pathology should you consider:

• Trigeminal autonomic cephalalgias if autonomic features develop (tearing, nasal congestion, facial swelling) 6
• Atypical migraine – but this remains a diagnosis of exclusion in this age group 7

The presence of persistent focal neurological signs (facial numbness) in a woman >50 years mandates aggressive investigation before any symptomatic headache treatment is considered 1, 7.