Idiopathic Intracranial Hypertension (IIH)

This illustration shows bilateral venous sinus narrowing (red circles).
This illustration shows bilateral venous sinus narrowing (red circles).
Idiopathic intracranial hypertension (IIH) is a condition characterized by high pressure in the fluid around the brain with no identifiable cause. Its alternate name of pseudotumor cerebri comes from its symptoms (including headache, blurred or double vision, ringing in the ears), which are similar to those of a brain tumor. But IIH is not a brain tumor — the presence of a tumor or other condition must be ruled out in order to make the diagnosis. 
For more information, visit our Pseudotumor Cerebri page

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Reviewed by: Srikanth Boddu, MD, MSc
Last reviewed/updated: August 2020
Illustrations by Thom Graves, CMI

Weill Cornell Medicine Brain & Spine Center 525 East 68 Street, Box 99 New York, NY 10065 Phone: 866-426-7787