- Impaired passage/absorption distal to 4th ventricle outlets
- Due to
- SAH
- Meningitis
- Leptomeningeal carcinomatosis
- All ventricles enlarged
- No intraventricular obstruction
- Variable degree of ventricular widening and of interstitial oedema
- Reduced dampening of the systolic pressure wave
- Look for
- Changes (enhancement/haemosiderin) in
- Meninges
- CSF
- Septation on CISS/FIESTA sq
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