Normal pressure hydrocephalus
 Discussion of Normal pressure hydrocephalus
- Normal pressure hydrocephalus (NPH) consists of the clinical triad of gait disturbance, dementia, and incontinence in a patient who radiographically has communicating hydrocephalus.
- The gait disturbance is a gait "apraxia" and represents a combination of motor deficits, failure of postural righting reflexes, abnormal smooth pursuit, and failed suppression of vestibuloocular reflexes.
- Problems with urinary functions begin with feelings of urgency, and in the later stages, develop into frank disinhibition.
- The dementia is subcortical and is characterized by inertia, forgetfulness, and poor executive function. The lack of cortical features helps to distinguish the dementia of NPH clinically from that of Alzheimer's disease.
 Imaging Findings for Normal pressure hydrocephalus
- CT and MRI displace communicating hydrocephalus.
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 References for Normal pressure hydrocephalus
- Bradley, William G. Normal Pressure Hydrocephalus: New Concepts on Etiology and Diagnosis. AJNR Am J Neuroradiol 2000 21: 1586-1590.