White cerebellum sign of hypoxic-ischaemic brain injury
Out of hospital arrest. Intubated.
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Reversal of normal attenuation of the supra and infratentorial brain - the cerebellum is denser ('white').
Loss of grey-white matter differentiation in the cerebral hemispheres.
Effacement of basal cisterns and sulci.
Impression of blood in the basal cisterns - pseudosubarachnoid haemorrhage.
White cerebellum sign, also called reversal sign or dense cerebellum sign, is encountered when there is a diffuse decrease in density of the supratentorial brain parenchyma, with relatively increased attenuation of the thalami, brainstem and cerebellum.
This sign indicates irreversible brain damage and has a very poor prognosis.
One of the commonest causes is cerebral anoxia, typically from a prolonged cardiac arrest.