Should a 68-year-old woman with a 4-day new-onset crown-region headache (8/10) and intermittent lower-extremity weakness be evaluated urgently for a possible intracranial cause?

Urgent Neuroimaging Required

This 68-year-old woman with new-onset severe crown-region headache (8/10) and intermittent lower-extremity weakness requires immediate neuroimaging with non-contrast head CT to evaluate for life-threatening intracranial pathology, particularly subarachnoid hemorrhage, cerebral venous thrombosis, or intracranial mass lesion.

Critical Red Flags Present

This patient has multiple concerning features that mandate urgent evaluation:

• New-onset headache in a patient >50 years old - Up to 15% of patients over 65 with new-onset headaches have serious pathology including stroke, temporal arteritis, neoplasm, or subdural hematoma 1, 2
• Focal neurological deficit (lower extremity weakness) - This is a major red flag indicating possible structural intracranial pathology 3, 4
• Severe headache intensity (8/10) - Patients with intracranial pathologies are significantly more likely to have severe headaches (59.7% vs 33.7%, P<.001) 4
• Crown/vertex location with pressure quality - While not classic for subarachnoid hemorrhage, atypical presentations are common

Why This Is NOT Migraine

Several features argue strongly against migraine:

• Absence of typical migraine features: No nausea, vomiting, photophobia, or phonophobia 5
• Age of onset: New-onset migraine at age 68 is extremely uncommon
• Focal weakness: While hemiplegic migraine exists, it's rare and a diagnosis of exclusion only after excluding stroke 6, 7
• Duration and pattern: 4-day persistent headache with focal deficits requires exclusion of secondary causes first

Immediate Diagnostic Approach

Step 1: Non-contrast head CT immediately 8, 9

• Sensitivity for subarachnoid hemorrhage: 95% on day 0, declining to 74% by day 3 1
• Will detect acute hemorrhage, mass lesions, hydrocephalus, or large infarcts
• If negative but high suspicion remains, proceed to Step 2

Step 2: If CT is negative, obtain:

• Lumbar puncture - Essential to exclude subarachnoid hemorrhage if CT negative and symptoms >6 hours from onset 8, 9
• MRI brain with and without contrast - Superior for detecting:
  • Cerebral venous thrombosis 10
  • Posterior circulation infarcts
  • Intracranial hypotension 11
  • Small mass lesions

Step 3: Consider CT or MR venography 10

• Given the combination of headache and lower extremity weakness, cerebral venous thrombosis must be excluded
• Superior sagittal sinus thrombosis can present with headache and motor deficits 10

Life-Threatening Diagnoses to Exclude

1. Subarachnoid hemorrhage - "Sentinel headache" occurs in 10-43% before major rupture; misdiagnosis increases mortality 4-fold 8, 9

2. Cerebral venous thrombosis - Can present with headache and focal deficits; may cause hemorrhagic transformation 12, 10

3. Intracranial mass - Tumor, abscess, or subdural hematoma can present with progressive headache and weakness 1, 2

4. Posterior circulation stroke - Can present with atypical headache patterns and limb weakness

5. Intracranial hypotension - Though typically orthostatic, can present with focal deficits in rare cases 11

Common Pitfall to Avoid

Do not attribute this presentation to migraine or tension-type headache without neuroimaging. The combination of new-onset headache at age 68 plus focal neurological deficit (weakness) has a significant probability of serious intracranial pathology. The yield of neuroimaging in patients with abnormal neurological findings is substantially higher than in those with normal examinations 13, 1.

The fact that ibuprofen provided temporary relief and symptoms improved with cold packs does not exclude serious pathology - even patients with subarachnoid hemorrhage may have partial symptom relief with analgesics.

Timing Is Critical

This evaluation should occur within hours, not days. If subarachnoid hemorrhage is present, the risk of catastrophic rebleeding is highest in the first 24-72 hours, with mortality rates exceeding 40% 14, 8. Delayed diagnosis of stroke or venous thrombosis worsens outcomes significantly 10.

The patient should be sent to the emergency department immediately for non-contrast head CT and neurological evaluation 9, 3.