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Table 2 Summary of MRI findings

From: Three-dimensional observation of Virchow–Robin spaces in the basal ganglia and white matter and their relevance to idiopathic normal pressure hydrocephalus

  Control iNPH P value
Number 9 20  
Evans index 0.27 ± 0.02 0.34 ± 0.03 <0.0001*
 Evans index >0.3, N (%) 9 (0) 20 (100) <0.0001*
Callosal angle (degree), mean ± SD 106 ± 10.2 66.6 ± 18.1 <0.0001*
 Callosal angle <90°, N (%) 0 (0) 18 (90) <0.0001*
High convexity tightness, N (%) 1 (11) 16 (80) 0.0021*
Enlarged Sylvian fissure, N (%) 0 (0) 16 (80) 0.0003*
Disproportionately enlarged subarachnoid-space hydrocephalus, N (%) 0 (0) 14 (70)  <0.0001*
Deep white matter hyperintensity (Fazekas rating scale)   0.0038*
 Grade 0, N 5 1  
 Grade 1, N 2 2  
 Grade 2, N 0 11  
 Grade 3, N 2 6  
Periventricular hyperintensity (Fazekas rating scale)   0.0013*
 Grade 0, N 5 0  
 Grade 1, N 1 3  
 Grade 2, N 3 7  
 Grade 3, N 0 10  
Virchow–Robin spaces in semioval center    0.0047*
 Grade 1 (few), N 0 10  
 Grade 2 (sparse), N 1 5  
 Grade 3 (abundant), N 8 5  
Virchow–Robin spaces in basal ganglia    0.1659
 Grade 1 (few), N 2 1  
 Grade 2 (sparse), N 1 8  
 Grade 3 (abundant), N 6 11  
  1. N number of individuals.
  2. * Statistically significant.