white cerebellum sign 

white cerebellum sign

IMAGING, NEUROLOGY

Definition The white cerebellum sign is a finding of diffusely decreased attenuation of the supratentorial brain compared to the infratentorial brain (cerebellum,  thalami, and brainstem), which appear denser (whiter). The sign indicates irreversible brain damage and carries a very poor prognosis.

Aetiology Extreme hypoxia, strangulation, drowning, trauma, child abuse or diffuse cerebral oedema. 

Synonym Dense cerebellum sign, reversal sign (of brain) 

Reference http://radiopaedia.org/articles/white-cerebellum-sign