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Table 2: Breakdown of intrinsic and extrinsic stenosis relative to the total number of sinuses and distribution of additional corollary findings noted in the idiopathic intracranial hypertension and pulsatile tinnitus cohorts^{^a}
Imaging Finding IIH PT
Stenosis type 
 Extrinsic stenosis 58 8
 Mixed extrinsic and intrinsic 17 0
 Intrinsic stenosis 40 37
 Total 115 45
χ² P value ≤ .001^{^b} 
Saccular venous aneurysm 
 Yes 4 11
 No 111 34
 Total 115 45
χ² P value ≤.001 
Sella appearance 
 Partially empty 49 18
 Empty 61 15
 Normal 5 11
 NA (adenoma) 0 1
 Total 115 45
χ² P value ≤ .001 
Optic nerve tortuosity 
 Minimal 46 31
 Marked 69 14
 Total 115 45
χ² P value = .001    
Note:—NA indicates not applicable; IIH, idiopathic intracranial hypertension; PT, pulsatile tinnitus.
↵a χ² cross-tabulation P values were calculated for each variable. Eighty-two percent of pulsatile tinnitus sinuses had intrinsic stenosis, and 65% of idiopathic intracranial hypertension sinuses had extrinsic stenosis (P value < .001). Statistically significant differences were noted when comparing the distribution of optic nerve tortuosity, sella appearance, and saccular aneurysm presence between the 2 groups (P values ≤ .001).
↵b Extrinsic and mixed subgroups summed for χ² calculation.