Crossed cerebellar diaschisis. Further studies

Area of Science:

• Neuroscience
• Neurology
• Radiology

Background:

• Crossed cerebellar diaschisis (CCD) is a neurological phenomenon observed after supratentorial brain lesions.
• Understanding its causes and clinical correlates is crucial for patient management.

Purpose of the Study:

• To investigate the topographical, clinical, and temporal associations of crossed cerebellar diaschisis following supratentorial stroke.
• To explore the relationship between infarct location, hemiparesis, and the development of CCD.

Main Methods:

• Quantitative oxygen-15 steady-state positron emission tomography (PET) was used.
• 55 patients with unilateral ischemic stroke in the carotid artery territory were studied.
• 14 patients underwent follow-up scans, totaling 72 studies.

Main Results:

• Crossed cerebellar diaschisis (CCD), defined by reduced contralateral cerebellar oxygen consumption, was observed in 58% of studies.
• CCD was more pronounced with extensive internal capsule or cortical mantle infarcts, supporting corticopontocerebellar fiber involvement.
• CCD showed association with hemiparesis but was not consistently present or absent, indicating it's neither necessary nor sufficient for pyramidal tract damage.

Conclusions:

• Crossed cerebellar diaschisis (CCD) is frequently associated with supratentorial strokes, particularly those affecting corticopontocerebellar pathways.
• The findings suggest CCD may represent a continuum from acute, reversible diaschisis to chronic, transneuronal degeneration.
• CCD can persist long-term but also manifest acutely, highlighting its dynamic nature post-stroke.