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Noun: pneumoencephalogram  ,n(y)oo-mow-en'se-fu-lu,gram
  1. An X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast
    - encephalogram

Derived forms: pneumoencephalograms

Type of: roentgenogram, X ray, X-ray, X-ray photograph, X-ray picture

Encyclopedia: Pneumoencephalogram