Table 1.

The modified Dandy criteria for IIH used in the IIHTT.

Signs and symptoms of increased intracranial pressure Absence of localizing findings on neurologic examination Absence of deformity, displacement, or obstruction of the ventricular system and otherwise normal neurodiagnostic studies, except for evidence of increased cerebrospinal fluid pressure (>200 mm water). Abnormal neuroimaging except for empty sella turcica, optic nerve sheathwith filled out CSF spaces, and smooth-walled non flow-related venous sinus stenosis or collapse106 should lead to another diagnosis Awake and alert No other cause of increased intracranial pressure present