Postmortem Cerebellar Volume Is Not Reduced in Essential Tremor: A Comparison with Multiple System Atrophy and...

Area of Science:

• Neuroscience
• Neuropathology
• Movement Disorders

Background:

• Essential tremor (ET) is a common movement disorder with reported, yet inconsistent, cerebellar alterations.
• Heterogeneity in findings necessitates further investigation into cerebellar volume changes in ET.

Purpose of the Study:

• To compare postmortem cerebellar volumes in individuals with ET, multiple system atrophy (MSA), and controls.
• To differentiate cerebellar pathology in ET from established neurodegenerative conditions like MSA.

Main Methods:

• Postmortem cerebellar volumes were analyzed in cases of ET (n=29), MSA (n=7), and controls (n=22).
• Data were sourced from the Arizona Study of Aging and Neurodegenerative Disorders (AZSAND) cohort.
• Comparisons controlled for age-related pathologies and cerebrovascular disease.

Main Results:

• No significant reduction in cerebellar volume was observed in ET subjects compared to controls.
• Cerebellar volume was significantly reduced in MSA subjects relative to both ET and control groups.
• No differences in Alzheimer's disease or cerebrovascular pathology were noted between ET and control groups.

Conclusions:

• Postmortem cerebellar volume measurements indicate no volume alterations in ET compared to controls.
• Significant cerebellar atrophy is present in MSA, distinguishing it from ET.
• These findings highlight distinct neuropathological profiles in ET and MSA.