Table 2:

Criteria for diagnosing IIH^a

1) If symptoms are present, they may only reflect those of generalized intracranial hypertension or papilledema

2) If signs are present, they may reflect only those of generalized intracranial hypertension or papilledema

3) Documented elevated ICP measured in the lateral decubitus position (findings of assessment of ICP by lumbar puncture are considered abnormal if above 20 cm H2O in normal-weight individuals and 25 mm H2O in obese individuals20); MRI abnormal if above 20 cm H2O in normal-weight individuals and 25 mm H2O in obese individuals20)

4) Normal CSF composition

5) No evidence of hydrocephalus, mass, structural, or vascular lesion on MRI or contrast-enhanced CT for typical patients and on MRI and MR venography for all others

6) No other cause of intracranial hypertension identified

^aAdapted from Friedman and Jacobson.⁷