. Author manuscript; available in PMC: 2017 Nov 1.

Published in final edited form as: Neurosurg Focus. 2016 Nov;41(5):E5. doi: 10.3171/2016.8.FOCUS16241

TABLE 3.

Pattern of CSF obstruction in infants with IVH, with and without PHH

Variable	PHH (%)	RVD (%)	p Value
No. of patients^*	42	18
Aqueduct	14 (33.3)	0 (0.0)
Posterior fossa (crowding)	3 (7.1)	1 (5.6)
Fourth ventricle outlets	22 (52.4)	0 (0.0)	<0.001^†
Supratentorial extraaxial space	0 (0.0)	9 (50.0)
Infratentorial extraaxial space	3 (7.1)	8 (44.4)

Limited to infants with MRI performed at the time of active ventricular dilatation. Reflects number of MR images available for quantification rather than total study participants.

^†

p value for homogeneity of distribution.