pneumoencephalogram
Noun: A medical diagnostic image, specifically an X-ray image of the brain, produced by a procedure in which cerebrospinal fluid is drained from around the brain and replaced with a gas (such as oxygen or air) to enhance the contrast and visibility of the brain's structures on the X-ray film.
This term is used exclusively in a medical context to refer to the resulting image from a pneumoencephalography procedure. It is a highly specialized term.
Examples: * The neurologist ordered a pneumoencephalogram to better visualize the ventricles of the brain. * Before the advent of CT and MRI scans, a pneumoencephalogram was a common, though invasive, method for diagnosing brain conditions. * The pneumoencephalogram revealed an abnormality in the fourth ventricle.
- The procedure to create this image, pneumoencephalography, is now considered obsolete due to its invasive nature and the discomfort it caused patients. It has been entirely superseded by non-invasive imaging techniques like computed tomography (CT) and magnetic resonance imaging (MRI).
- The term is often encountered in historical medical texts or when discussing the history of neuroradiology.
- Pneumoencephalography (n): The medical procedure of taking a pneumoencephalogram.
- Encephalogram (n): A general term for an image or record of the brain's electrical activity or structure. A pneumoencephalogram is a specific type of structural encephalogram.
- Ventriculogram (n): An X-ray image of the brain's ventricles, which a pneumoencephalogram was often used to produce.
- PEG (acronym): A common medical abbreviation for PneumoEncephaloGram.
- Air encephalogram: A descriptive synonym highlighting the contrast medium used.
This word has only one, very specific meaning within the field of medicine and medical history. It does not have idiomatic or phrasal verb uses.
- an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast