PT - JOURNAL ARTICLE AU - H A Shenkin AU - J O Greenberg AU - C B Grossman TI - Ventricular size after shunting for idiopathic normal pressure hydrocephalus. AID - 10.1136/jnnp.38.9.833 DP - 1975 Sep 01 TA - Journal of Neurology, Neurosurgery & Psychiatry PG - 833--837 VI - 38 IP - 9 4099 - http://jnnp.bmj.com/content/38/9/833.short 4100 - http://jnnp.bmj.com/content/38/9/833.full SO - J Neurol Neurosurg Psychiatry1975 Sep 01; 38 AB - It has been presumed that idiopathic normal pressure hydrocephalus is due to obstruction. We visualized the ventricles in 19 patients subsequent to shunting. We found no consistent relationship between clinical improvement after shunting and reduction in ventricular size. This suggests that the positive effect of shunting in at least some instances is due to some other factor than reduced ventricular size.