Idiopathic intracranial hypertension (IIH) is a rare cause of headache and visual disturbance with no known association with sickle cell disease (SCD). We present a patient with SCD with gradual onset of a severe headache and visual changes. Brain magnetic resonance imaging, angiography, and venography were nondiagnostic. Lumbar puncture established a diagnosis of IIH, and the patient had rapid improvement with large-volume lumbar puncture and acetazolamide. To our knowledge, this is the first case of IIH in a nonobese adult with SCD taking hydroxyurea, suggesting an association between SCD or hydroxyurea use and IIH. Furthermore, her clinical course demonstrates the complexities of treating IIH in patients with SCD.
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