differentiation between grey and white matter. It is important to view CT scans of the head performed for trauma on a number of different window settings. Skull fractures are much more apparent on bone windows (see Figs 5.39 and 5.40) than on the corresponding soft tissue windows. In the trauma setting it is important to search for air within or surrounding the brain as this is indicative of a skull fracture (Figs 5.41 and 5.42). More subtle appearances on CT can, nevertheless, be indicative of severe injury and are associated with considerable morbidity. Figures 5.43 and 5.44 demonstrate
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