Air encephalogram or pneumoencephalography refers to the radiographic visualization of the fluid-containing structures of the brain, the ventricles, and spinal column. It is similar to the X-ray, but it involves the withdrawal of cerebrospinal fluid by lumbar puncture, which is then replaced with a gas including air, oxygen, or helium.

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Cerebrospinal fluid (CSF) at■■■■■■
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Intraventricular hemorrhage (IVH) at■■■■■
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Foramina of Luschka at■■■■
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Subarachnoid space at■■■
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