Definition of "pneumoencephalogram" [pneumoencephalogram]

• An image produced by means of pneumoencephalography. (noun)

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• "Prior to the invention of CT scanning, a pneumoencephalogram was the only diagnostic tool for the inner parts of the brain."
• "The procedure was a spinal tap and a pneumoencephalogram."
• "There, at a facility grounded in the tradition of the Sisters of St. Joseph of Carondelet, a team of physicians led by Dr. Eric Yuhl and Dr. Duke Hanna put the little girl through a battery of tests, culminating in a pneumoencephalogram."