Table 1:

Clinical characteristics in 36 patients with IH and 36 control subjects

Patient Group^a	Opening CSF Pressure on LP in cm H₂O (mean) (range)	Demographics		Diagnosis, Clinical Signs, and Symptoms
Patient Group^a	Opening CSF Pressure on LP in cm H₂O (mean) (range)	Group Size, Sex	Patient Age (mean) (range)	Diagnosis	Papilledema	Mild VI	Severe VI	Headache	Nausea/Vomiting	Other Symptoms
All patients with IH	39.8 (24–70)	n = 36 F (n = 23)M (n = 13)	40.9 yr 2–76 yr	Meningeal disease (n = 10), thrombosis or occlusion of venous sinus or the dominant IJV (n = 10), intracranial tumor (n = 8), hydrocephalus (other than caused by tumor, n = 5), other (n = 5), see below, multiple (n = 3)	23/35 66%	20/36 56%	12/36 33%	30/36 83%	9/36 25%	See below
Patient Subgroup I	29.5 (22–38)	n = 12 F (n = 7)M (n = 5)	41.6 yr 32–66 yr	Occlusion of a venous sinus or IJV by meningioma or postoperatively (n = 3), viral meningitis (n= 3), bacterial meningitis (n = 1), venous sinus thrombosis (n = 1), excessive arterial hypertension (n = 1), head trauma with hygromas (n = 1), hydrocephalus (n = 1), minocycline medication (n = 1)	7/12 58%	7/12 58%	3/12 25%	12/12 100%	4/123 3%	Fever, meningism (n = 4), transient aphasia (n = 3), vertigo (n = 2), transient apraxia (n = 1), cough (n = 1), hypacusis (n = 1), tinnitus (n = 1), reduced consciousness (n= 1), paraesthesia (n = 1)
Patient Subgroup II	52 40–70	n = 10 F (n = 6)M (n = 4)	34.5 yr 2–62 yr	Thrombosis of venous sinus or IJV (n = 4), hydrocephalus (n = 3), meningiosis (n = 2), neurosarcoid meningitis (n = 1)	7/97 8%	4/10 40%	5/10 50%	8/10 80%	3/10 30%	Vertigo, dysaesthesia (n = 1), tinnitus (n = 1), double vision (n = 1), head enlargement (n = 1), unspecific feeling of illness (n = 1)
Patient Subgroup III	Not tested^b	n = 14 F (n = 10)M (n = 4)	44.8 yr 9–76 yr	Meningioma alone or combined with stenosis or occlusion of a venous sinus (n = 4), venous sinus thrombosis alone or combined with brain abscess or dural metastasis (n = 3), brain tumor with occlusive hydrocephalus (n = 2), meningeosis (n = 2), arterial hypertension, PRES (n = 1), hydrocephalus (n = 1)	9/14 64%	9/14 64%	4/14 29%	10/14 71%	2/14 14%	Double vision (n = 4), paresis (n = 4), reduced consciousness (n = 3), nystagmus (n = 1). vertigo (n = 1), fever (n = 1)
Controls	Not tested.	n = 36 F (n = 23) M (n = 13)	39 yr 2–80 yr	Mostly psychiatric	Not tested	0/36 0%	0/36 0%	0/36 0%	0/36 0%

a Patients with IH (n = 36) were subgrouped into those with CSF pressure <40 cm H₂O (n = 12, group I), those with >40 cm H₂O (n = 10, group II), and those without direct pressure measurements (n = 14, group III).
b In subgroup III, 3 patients were reported to have elevated CSF pressure intraoperatively.