Extradural haematoma: hyperacute
Pedestrian hit by vehicle.
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A 2.5 cm thick biconvex extra-axial collection overlying the right temporoparietal lobe is predominantly isodense but contains streaky high density material within in a horizontal orientation emanating from the expected location of the middle meningeal artery. There is mass-effect with compression of the right temporal lobe, sulcal effacement in the right cerebral hemisphere, 9 mm midline shift to the left, mild compression of the right lateral ventricle and right-sided sub falcine herniation. Small foci high attenuation in the right temporal lobe are suspicious for small petechial haemorrhages as well as subarachnoid haemorrhages.
No skull vault or skull base fracture is seen, but there is a scalp haematoma and wound overlying the right skull.