Table 3:

Continued breakdown of intrinsic and extrinsic stenosis relative to the total number of sinuses and distribution of additional corollary findings noted in the idiopathic intracranial hypertensin and pulsatile tinnitus cohorts^{^a}

Imaging Finding	IIH	PT
Internal jugular bulb diverticulum size
<5 mm	47	26
≥5 mm	68	19
Total	115	45
χ² P value = .053
Cerebellar tonsil location
Above	22	11
At	54	23
Ectopia	35	11
Above (prior Chiari I surgery)	4	0
Total	115	45
χ² P value = .522
Cephalocele presence
No	110	44
Yes	5	1
Total	115	45
χ² P value = .525
Emissary vein prominence
Condylar	52	19
Occipital and condylar	28	11
Mastoid	6	1
Mastoid and condylar	5	3
Occipital, condylar, and mastoid	1	2
None	23	9
Total	115	45
χ² P value = 1

Note:—IIH indicates idiopathic intracranial hypertension; PT, pulsatile tinnitus.
↵a No significant differences were noted when comparing the distribution of internal jugular bulb diverticulum size, cerebellar tonsil location, cephalocele presence, or emissary vein prominence (P values ≥ .053).