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Table 2: 
Morphologic MR imaging results*
PresentAbsentUnknown
Triventricular dilation1700
Small/normal 4th V1700
Direct CSF pathway obstruction (sagittal T2)1043
Downward bulging of the floor of the 3rd V1070
Space-occupying lesion3140
  • Note:—4th V indicates fourth ventricle; 3rd V, third ventricle.
  • * Numbers refer to the patients in each category.