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Table 2: 

Type of transverse sinus stenosis found at direct venography in 52 patients with IIH
Type of StenosisNo.
Intrinsic/extrinsic of both sinuses16
Intrinsic/extrinsic of dominant sinus, hypoplastic sinus8
Intrinsic of both sinuses8
Intrinsic of dominant, hypoplastic sinus9
Extrinsic of both sinuses7
Extrinsic of dominant, hypoplastic sinus4