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pneumoencephalography (new-moh-en-sef-ă-log-răfi) n. a technique used in the X-ray diagnosis of disease within the skull. Air is introduced into the ventricles of the brain to displace the cerebrospinal fluid, thus acting as a contrast medium. X-ray photographs show the size and disposition of the ventricles and the subarachnoid spaces. The technique has largely been superseded by CT and MRI scanning.