crossed cerebellar diaschisis
Pronunciation: die-AS-ki-sis
Reduced cerebellar perfusion contralateral to a supratentorial lesion due to interrupted corticopontocerebellar pathways.
Full Definition
Crossed cerebellar diaschisis refers to the phenomenon of reduced blood flow and metabolism in the cerebellar hemisphere contralateral to a supratentorial brain lesion, typically a stroke. This occurs due to interruption of the corticopontocerebellar pathway, which normally provides excitatory input to the contralateral cerebellum. The condition can be detected using perfusion imaging, PET, or SPECT studies and typically manifests as hypoperfusion without structural abnormality. Recovery may occur over time if the supratentorial lesion improves, making this a potentially reversible form of remote dysfunction.
Usage
Usage note: Always specify relationship to supratentorial lesion; distinguish from primary cerebellar pathology.
In Context
- "Perfusion imaging revealed crossed cerebellar diaschisis contralateral to the large MCA territory infarct." — Perfusion imaging report
- "The cerebellar hypoperfusion was attributed to crossed cerebellar diaschisis rather than primary cerebellar pathology." — Nuclear medicine interpretation