<prompt> Which of the following is not a feature of normal pressure hydrocephalus: September 2011Affects elderly usuallyVentriculomegaly on imaging studiesMeasurement of CSF pressure may be normalLesion is blockage of CSF pathways from the lateral to fouh ventricle  <response>: Ans. D: Lesion is blockage of CSF pathways from the lateral to fouh ventricle Although one-off measurement of CSF pressure may be normal the syndrome is thought to arise from impaired CSF absorption 