. . . . "an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast"@en-us . "pneumoencephalogram"@en-us . "encephalogram"^^ . "103285730"^^ . . . . . "103166525"@en-us . . "encephalogram"@en-us . . "0"^^ . . "0"^^ . "03285730-n"^^ .