Purpose: Crossed cerebellar diaschisis refers to metabolic depression in the cerebellum contralateral to supratentorial lesions. It was first described in the positron emission tomography (PET) literature. Crossed cerebellar diaschisis is interpreted as functional deactivation, presumably caused by a loss of excitatory or inhibitory afferent inputs, on the corticopontocerebellar or other pathways. This phenomenon has been repeatedly described in studies examining oxygen consumption, cerebellar blood flow and …