Modified Dandy Criteria for Idiopathic Intracranial Hypertension

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1. Signs and symptoms of increased intracranial pressure (headaches, nausea, vomiting, transient visual obscurations, papilledema).

2. No localizing neurologic signs, with the exception of unilateral or bilateral cranial nerve VI paresis.

3. Cerebrospinal fluid can show increased pressure, but otherwise without cytological or chemical abnormalities.

4. Normal to small symmetric ventricles must be demonstrated by neuroimaging.

Note: the typical patient profile ("typical patient;" see Table 13) of a young obese woman is not required by these criteria, although the presence of idiopathic intracranial hypertension in a child, man, or thin or elderly individual would now be classified as being an "atypical case."

The modified Dandy criteria have been clarified by Friedman and Jacobson, in accordance with improved neuroimag-ing data.

(Adapted with permission from Friedman DI, Jacobson DM. Diagnostic criteria for idiopathic intracranial hypertension. Neurology 2002;59:1492-1495, and from Lippincott, Williams, and Wilkens.)

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