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NBME 22 Answers

nbme22/Block 4/Question#12

A 73-year-old woman dies 7 years after the onset of ...

Hydrocephalus ex vacuo

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submitted by dr.xx(45),

The four types of hydrocephalus are communicating, noncommunicating, ex vacuo, and normal pressure. Diagnosis is typically made by physical examination and medical imaging.

Hydrocephalus ex vacuo also refers to an enlargement of cerebral ventricles and subarachnoid spaces, and is usually due to brain atrophy (as it occurs in dementias), post-traumatic brain injuries and even in some psychiatric disorders, such as schizophrenia. As opposed to hydrocephalus, this is a compensatory enlargement of the CSF-spaces in response to brain parenchyma loss; it is not the result of increased CSF pressure.

https://en.wikipedia.org/wiki/Hydrocephalus#Type