Crossed cerebellar diaschisis
Crossed cerebellar diaschisis (CCD) refers to a depression of blood flow and metabolism affecting the cerebellar hemisphere occurring as a result of a contralateral focal, supra-tentorial lesion (e.g. infarct, radiation necrosis, following a tumor resection).
It is a well-recognized phenomenon following cerebral infarction. The most likely mechanism is thought to be interruption of cortico-ponto-cerebellar connections due to the infarct which then causes deafferentation and transneural metabolic depression of the contralateral cerebellar hemisphere
Has to be interpreted in the correct clinical context.
CT / MRI and CT perfusion
CT perfusion performed during acute stroke may show a contralateral perfusion abnormality in about 20 % of cases4 . CBF and CBV maps show only mild to moderate reduction in the parameters and are never low to classify them as infarcts. There can be volume loss to the contra lateral cerebellar hemisphere.
Shows hypo metabolism in affected cerebellar hemisphere 2.