Normal Pressure Hydrocephalus

Normal pressure hydrocephalus is a reversible cause of dementia seen in elderly patients. It is thought to be secondary to reduced CSF absorption at the arachnoid villi. These changes may be secondary to head injury, subarachnoid haemorrhage or meningitis

A classical triad of features is seen
urinary incontinence
dementia and bradyphrenia
gait abnormality (may be similar to Parkinson's disease)

Imaging
hydrocephalus with an enlarged fourth ventricle

Management
ventriculoperitoneal shunting

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