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radiographic visualization of the fluid-containing structures of the brain after cerebrospinal fluid is intermittently withdrawn by lumbar puncture and replaced by air, oxygen, or helium.
Radiographic visualization of cerebral ventricles and subarachnoid spaces by use of gas such as air; no longer used because of CT and MRI.
[G. pneuma, air, + enkephalos, brain, + graphō, to write]
pneumoencephalography/pneu·mo·en·ceph·a·log·ra·phy/ (PEG) (-en-sef″ah-log´rah-fe) radiography of fluid-containing structures of the brain after cerebrospinal fluid is intermittently withdrawn by lumbar puncture and replaced by a gas.
Etymology: Gk, pneuma, air, enkephalos, brain, graphein, to record
a procedure for the radiographic visualization of the ventricular space, basal cisterns, and subarachnoid space overlying the cerebral hemispheres of the brain. Air, helium, or oxygen is injected into the lumbar subarachnoid space after the intermittent removal of the cerebrospinal fluid by lumbar puncture. See also encephalography, ventriculography. pneumoencephalographic, adj.
pneumoencephalographyA method of X-ray examination of the VENTRICLES of the brain in which the CEREBROSPINAL FLUID is replaced by air. This very unpleasant procedure has been rendered obsolete by CT SCANNING and MRI.
radiographic visualization of the fluid-containing structures of the brain after cerebrospinal fluid is withdrawn and replaced by air, oxygen or helium.