In a 23‑year‑old woman with a prior history of migraine who presents with a new severe left‑sided throbbing headache that worsens on standing, accompanied by neck stiffness, facial muscle twitching, unilateral tinnitus, dizziness, and a normal head CT, what is the most appropriate next step in management?

This is NOT a migraine—you need urgent evaluation for spontaneous intracranial hypotension (SIH) or other serious secondary causes

The strict postural pattern of your headache (worse standing, better lying flat), combined with neck stiffness, unilateral symptoms, and the fact that this is completely different from your usual migraines, strongly suggests spontaneous intracranial hypotension (SIH) rather than migraine. Your normal CT scan does not rule out SIH, and you require immediate further workup.

Why This is NOT Your Typical Migraine

Your presentation has multiple red flags that distinguish this from migraine 1:

• Orthostatic headache pattern: Your headache is absent/mild on waking, worsens within minutes to hours of standing, and improves significantly (>50%) within 2 hours of lying flat. This is the hallmark of SIH 1
• Different quality: You explicitly state this feels completely different from your usual migraines—you lack the photophobia you typically experience
• Neck stiffness: This is a concerning feature that warrants investigation for secondary causes
• Unilateral facial symptoms: The deep throbbing pain, tingling, and muscle twitching in your left cheek are atypical for migraine
• Persistent unilateral tinnitus: Especially the intensity that mimics external sounds
• Progressive symptoms: Your symptoms have actively worsened over the week despite the ER visit

Critical Next Steps

You need urgent referral to a neurologist within 48 hours 1. Given that you can care for yourself but are significantly impaired, this timeframe is appropriate. However, if you develop:

• Inability to care for yourself without help
• Worsening neurological symptoms
• Severe mental status changes
• Seizures

You need emergency admission immediately 1.

Required Diagnostic Workup

Your normal CT scan is insufficient. You need:

1. MRI brain with and without contrast: To look for signs of intracranial hypotension (brain sagging, subdural collections, pachymeningeal enhancement)
2. MR venography (MRV): To rule out cerebral venous sinus thrombosis, which can present with postural headache and was missed in similar cases with normal initial imaging 2
3. Spine MRI: If SIH is suspected, to identify the site of CSF leak
4. Formal autonomic testing: To exclude postural tachycardia syndrome (PoTS) or orthostatic hypotension, which can mimic SIH 1

Why Your EKG Finding Matters

The left atrial enlargement and abnormal T wave require follow-up, particularly given your age. While not directly related to your headache, this needs cardiology evaluation to rule out structural heart disease or arrhythmias that could contribute to your symptoms.

Common Pitfalls to Avoid

Do not accept a diagnosis of "complex migraine" without proper imaging. The guidelines are clear: headaches with atypical features or that don't meet strict migraine criteria warrant neuroimaging 3. Your presentation has multiple atypical features:

• New orthostatic pattern
• Neck stiffness
• Unilateral facial symptoms beyond typical migraine distribution
• Absence of typical migraine features (photophobia)
• Thunderclap-like onset that evolved into orthostatic pattern

Do not start migraine-specific treatments (triptans) without proper diagnosis. While triptans are appropriate for confirmed migraine 4, using them in your case could mask a serious underlying condition and delay appropriate treatment.

Differential Diagnoses to Rule Out

Beyond SIH, your neurologist must exclude:

• Cerebral venous sinus thrombosis: Can present with postural headache, neck stiffness, and unilateral symptoms. Recent cases show normal D-dimer doesn't exclude this 2
• Cervical artery dissection: Can cause unilateral headache, neck pain, and facial symptoms
• Subarachnoid hemorrhage: Though your CT was normal, delayed presentations can occur, especially with your thunderclap-like initial onset 5
• Meningitis: Neck stiffness and progressive headache warrant consideration
• Posterior fossa pathology: Can cause postural headache and cranial nerve symptoms

If SIH is Confirmed

Treatment typically involves:

1. Conservative management first: Bed rest, aggressive hydration, caffeine
2. Epidural blood patch (EBP): If conservative measures fail, this is highly effective for SIH 1
3. Referral to specialist center: If first-line treatments fail or diagnosis is uncertain 1

Immediate Actions You Should Take

1. Contact your primary care physician or neurologist TODAY to arrange urgent evaluation
2. Maintain a headache diary: Document exact timing of headache onset after standing, improvement after lying flat, and associated symptoms
3. Avoid prolonged standing: Until evaluated, minimize upright time to reduce symptoms
4. Stay well-hydrated: Drink at least 2-3 liters of fluids daily
5. Consider caffeine: 200-300mg of caffeine can temporarily help if this is SIH

Do not wait for symptoms to worsen. The postural pattern of your headache, combined with neck stiffness and progressive symptoms, requires urgent neurological evaluation with appropriate imaging beyond the CT scan you already had.