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Volumetry results for different intracranial compartments^{^a}
Before Surgery After Surgical Closure of Spinal Dural Tear Difference: Absolute and Relative P Value Measurement Uncertainty
SIH score 6.9 ± 2.2 2.9 ± 1.7 <.001 
Ventricular CSF (mL) 15.3 ± 6.3 18.0 ± 7.4 +2.7 (+18.8%) <.001 0.2
Lateral ventricle (mL) 12.9 ± 5.9 15.2 ± 6.9 +2.3 (+18.7%) <.001 0.2
Third ventricle (mL) 0.8 ± 0.4 1.0 ± 0.3 +0.2 (+25.5%) <.001 0.02
Fourth ventricle (mL) 1.5 ± 0.4 1.8 ± 0.4 +0.3 (+20.9%) .008 0.05
Total brain parenchyma (mL) 1136.9 ± 116.6 1133.1 ± 111.0 −3.8 (−0.3%) .58 7.6
Gray matter (mL) 652.0 ± 73.7 644.8 ± 64.3 −7.2 (−0.9%) .18 7.3
White matter (mL) 458.7 ± 53.0 462.4 ± 54.9 +3.7 (+0.8%) .27 10.8
Brain stem 22.9 ± 3.6 22.7 ± 3.5 −0.2 (−0.9%) .34 0.2
↵a Measurements show the mean volume in milliliters; the only exception is the SIH score in the first line.