<prompt> In Hydrocephalus ex vacuo, the compensatory enlargement of ventricles and an increase in CSF volume due to brain atrophy is seen in-Alzheimers diseaePicks diseasesBothNone of the above  <response>: Hydrocephalus ex vacuoInsignificant cortical atrophy, there is compensatory ventricular enlargement secondary to loss of parenchyma Hydrocephalus ex vacuo.This can be seen in Alzheimer disease and Pick disease. - Anderson 10thep. 2740. 