# pneumoencephalography

> English word · Noun

## Definitions
1. A former medical procedure in which most of the cerebrospinal fluid was drained from around the brain and replaced with air, oxygen, or helium to allow the structure of the brain to show up more clearly on an X-ray image.

## Etymology
From pneumo- + encephalography.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/pneumoencephalography