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What to suspect to write justification for mri brain in patient of sever headache

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"Headache"[MeSH Terms] AND "Neuroimaging"[MeSH Terms]

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ACR Appropriateness Criteria headache red flags MRI brain 2025

For MRI brain justification in a patient with severe headache, document a suspected secondary headache with red-flag features, not simply “severe headache.”
Possible wording for request:
Severe new-onset/progressive headache with [insert red flags]. MRI brain requested to exclude intracranial space-occupying lesion, posterior fossa pathology, hydrocephalus, inflammatory/infectious pathology, demyelination, or other structural intracranial cause.
Include the actual applicable red flags:
  • Sudden thunderclap onset or “worst headache of life”
    • Acute CT head is usually first to exclude hemorrhage. MRI/MRA/MRV may follow depending on findings and timing.
  • New headache after age 50
  • New or progressively worsening headache, especially different from the usual pattern
  • Focal neurologic deficit: weakness, numbness, facial asymmetry, aphasia, ataxia, diplopia, seizures, altered sensorium
  • Papilledema or visual symptoms, suggesting raised intracranial pressure
  • Positional headache, worse with Valsalva/cough/exertion, or morning vomiting
  • Fever, neck stiffness, systemic illness, concern for CNS infection/inflammation
  • History of malignancy, especially with possible brain metastasis
  • Immunosuppression/HIV
  • Pregnancy or postpartum, particularly with visual symptoms, seizures, or hypertension, where MRI plus MR venography may be relevant
  • Recent head trauma
  • Hypercoagulable state, oral contraceptive use, postpartum status, concern for cerebral venous sinus thrombosis
  • New headache with seizures or cognitive/personality change
Example strong justifications
  1. “New severe progressive headache for 3 weeks with early-morning worsening, vomiting and blurred vision. Evaluate for raised intracranial pressure and intracranial mass lesion.”
  2. “Severe new-onset headache with focal left-sided weakness and imbalance. MRI brain requested to exclude acute ischemia, mass lesion, demyelination or posterior fossa pathology.”
  3. “Severe headache with papilledema and transient visual obscurations. MRI brain with MR venography requested to exclude mass lesion and cerebral venous sinus thrombosis.”
  4. “New severe headache in patient with known malignancy. Evaluate for intracranial metastases, edema, hemorrhage or leptomeningeal disease.”
  5. “New persistent severe headache in an immunocompromised patient with fever. Evaluate for CNS infection, abscess, opportunistic lesion or malignancy.”
Do not write a diagnosis that is not clinically supported. Document the real symptoms and examination findings. Uncomplicated stable migraine or tension-type headache with a normal neurologic examination generally does not itself justify brain MRI. The ACR notes imaging is more appropriate when headache has red flags such as neurologic deficit, cancer, immunocompromise, pregnancy, age over 50 at onset, trauma, positional/activity-related features, or papilledema, as summarized in the ACR headache guidance. MRI is particularly useful for persistent headache when assessing structural lesions; for abrupt suspected hemorrhage, CT is usually the initial study. Goldman-Cecil Medicine, Table 367-2; Harrison’s Principles of Internal Medicine, 22nd ed., clinical evaluation of acute new-onset headache.
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