A radiographic technique (now largely superseded) for examining the brain. It involved displacing the cerebrospinal fluid in the ventricles of the brain by air or oxygen, which served as a contrast medium.
- Pneumoencephalography has proved so useful in the investigation of disease of central nervous system that it is now widely practised.
- Pneumoencephalography was performed extensively throughout the late 20th century, but it was extremely painful and, as researchers would later discover, very dangerous
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