White cerebellum sign
Severe head trauma in road traffic accident.
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Diffuse supratentorial hypodensity with poor grey white matter differentiation is seen involving both cerebral hemispheres. The possibility of post traumatic ischemic changes is suggested.
Further evidence of small hyper dense area is seen in right temporal region. This could represent small contusion.
White cerebellum sign (also called reversal sign or dense cerebellum sign) is encountered owing to direct severe head trauma during road traffic accident (RTA). This sign denotes irreversible brain damage . It has a very poor prognosis, that is why radiologists must be aware of this sign.