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A multidisciplinary expert panel provides an updated, evidence-based consensus and rationale for initial imaging studies in common headache presentations in adults.
For thunderclap headache, computed tomographic (CT) imaging of the head (CTH) without contrast remains the most appropriate, although CT arteriogram may be appropriate in certain circumstances.
For new headache with optic disc edema, magnetic resonance (MR) imaging of the brain (MRIB) with or without contrast or CTH without contrast are usually appropriate, while CTH with contrast and CT or MR venography may be appropriate.
New or progressive headache with “red flags” (e.g., subacute head trauma…