Diagnosis of Normal-Pressure Hydrocephalus

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Abstract
When normal-pressure hydrocephalus is suspected on the basis of clinical findings, the diagnosis can be confirmed by use of intrathecal radioisotope scans and pneumoencephalographic findings. The pneumoencephalographic studies clearly outline the ventricular space and provide evidence of the presence or absence of obstructive hydrocephalus. The isotope scan, done over a period of three or four days, offers a dynamic picture of cerebrospinal-fluid circulation. From the combination of tests, cases with obstructive-communicating hydrocephalus can be defined for consideration for ventricular-shunt procedures.