Criteria for diagnosing IIHa
| 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 |
↵a Adapted from Friedman and Jacobson.7