From 1981 to 1985 a prospective study on normal pressure hydrocephalus was performed. One of the aims of this study was to determine the site of CSF obstruction. Among 17 consecutive patients with a tentative diagnosis of normal pressure hydrocephalus, nine appeared to have non-communicating hydrocephalus most probably due to primary non-tumoural aqueduct stenosis. This unexpected finding provides evidence that non-tumoural aqueduct stenosis is a frequent cause of normal pressure hydrocephalus in older patients. Some clinical, aetiological and therapeutic aspects in this particular subgroup are discussed.
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