Non-contrast CT shows:
localised hyperdense swelling of the subcutaneous tissue at the right temporo-parieto-occipital region, indicating subgaleal haematoma
right temporal parenchymal contusion
a large amount of air is noted within the frontal and temporal subdural space bilaterally, compressing the frontal and temporal lobes and forming a peaking sign, and extending into the longitudinal fissure anteriorly, and separating the frontal lobes, resulting the so-called Mount Fuji sign
many air bubbles are noted within the subarachnoid space bilaterally, mainly in the Sylvian fissures, this is called air bubble sign
the air is noted within the lateral ventricles, the 3rd and 4th ventricles, forming an air-fluid level, representing pneumoventricle
the vertebral and basilar arteries are surrounded by air within the premedullary and prepontine cisterns
some air bubbles are noted within the spinal canal, which is known as pneumorrhachis
some air within the right parapharyngeal space is noted