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Table 3: Preoperative morphologic MRI markers in 168 patients with iNPH
All Patients No. Median/% (IQR) Improved (Median/%) Not Improved (Median/%) P
Evans index 0.41 (0.37–0.44) 0.40 0.39 NS
Temporal horns (mm) 9.1 (7.5–11.0) 9.0 9.1 NS
Callosal angle 68° (56°–81°) 68° 69° NS
Third ventricle width (mm) 15.5 (13.3–18) 15.4 16.5 NS
Fourth ventricle width (mm) 14.7 (13.2–16.3) 14.7 14.6 NS
Transport sulci (%) 0 72 75 68 NS
1 17 19 11 
2 8 6 14 
>2 3 0 7 
Dilated interhemispheric fissure (%) 0 42 45 38 NS
1 49 45 54 
2 9 10 8 
Obliterated sulci at vertex (%) 36 36 35 NS
Dilated Sylvian fissure (%) 0 28 31 22 
1 45 45 46 
2 27 24 32 
DESH present (%) 36 36 34 NS
Flow void sign (%) 0 0 0 0 
1 30 30 26 
2 42 37 47 
3 28 35 27 
PVH (%) 0 0 0 0 NS
1 57 58 49 
2 26 25 29 
3 17 17 22 
DWMH (%) 0 0 0 0 NS
1 46 47 45 
2 37 42 29 
3 17 11 26 
Note:—PVH indicates periventricular hyperintensities; DWMH, deep white matter hyperintensities; NS, not significant; IQR, interquartile range.