Idiopathic Intracranial Hypertension.

Idiopathic intracranial hypertension (IIH) causes raised intracranial pressure with no underlying structural etiology and is associated with headache and vision changes. Neuro-ophthalmologic evaluation and monitoring for papilledema and visual field constriction, contrast-enhanced brain MRI with venous imaging, and lumbar puncture are required to diagnose IIH. Weight loss yields remission in most patients. Secondary therapies include carbonic anhydrase inhibitors and surgical options, including venous sinus stenting or cerebrospinal fluid (CSF) diversion for patients with severe vision loss. Otolaryngologists should maintain a high index of suspicion for this condition in patients with skull base CSF leaks.