Magnetic resonance imaging finding in normal pressure hydrocephalus
Expansion
Disproportionately Enlarged Subarachnoid-space Hydrocephalus
Purpose
Ventricles enlarged disproportionately more than sulci
Clinical Context
Disproportionately enlarged subarachnoid-space hydrocephalus shows disproportionate ventricular enlargement relative to sulcal prominence. Evan’s index (max lateral ventricular width divided by inner skull diameter) greater than 0.3 suggests normal pressure hydrocephalus.
Related Terms
- Normal pressure hydrocephalus
- Hydrocephalus
Key Points
- Disproportionately enlarged subarachnoid-space hydrocephalus on magnetic resonance imaging is imaging marker for normal pressure hydrocephalus; Evan’s index greater than 0.3 supports normal pressure hydrocephalus