How is a diagnosis of normal pressure hydrocephalus (NPH) established from imaging results?

Updated: Oct 19, 2018
  • Author: Michael J Schneck, MD, MBA; Chief Editor: Selim R Benbadis, MD  more...
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Answer

To establish a diagnosis of NPH (and exclude hydrocephalus ex vacuo), an MRI or CT must show an Evan’s index of at least 0.3. [12] In addition, one or more of the following must also be present:

  • Temporal horn enlargement

  • Periventricular signal changes

  • Periventricular edema

  • Aqueductal/fourth ventricular flow void


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