Cerebral gray matter volume losses in essential tremor: A case-control study using high resolution tissue probability...

Area of Science:

• Neuroimaging
• Neurology
• Neurodegeneration

Background:

• Essential tremor (ET) is increasingly understood as a complex disorder with both motor and non-motor symptoms.
• Research is expanding beyond the traditional cerebellar motor loop to investigate other brain regions in ET.
• Accurate detection of cerebral gray matter (GM) atrophy necessitates optimized processing of high-resolution magnetic resonance imaging (MRI).

Purpose of the Study:

• To investigate cerebral GM volume loss in individuals with Essential Tremor (ET).
• To utilize automated segmentation of MRI T1-weighted images for detecting GM atrophy in ET.
• To identify specific brain regions affected by GM volume reduction in ET patients.

Main Methods:

• Acquired MRI data from 47 ET cases and 36 controls.
• Employed automated segmentation and voxel-wise comparisons using Statistical Parametric Mapping (SPM).
• Utilized the ICBM 2009a atlas and tissue probability maps for enhanced image processing, controlling for age, sex, and MoCA scores.

Main Results:

• Consistently identified cerebral GM volume loss in ET patients and subgroups.
• Detected atrophy in the posterior insula, superior temporal gyri, cingulate cortex, inferior frontal gyri, and occipital/parietal regions.
• Observed no significant increases in GM volume in ET patients compared to controls.

Conclusions:

• This study provides evidence of widespread GM volume loss throughout the cerebrum in ET.
• Improved methodologies confirm GM atrophy extends beyond the cerebellum in Essential Tremor.
• Findings highlight the multi-dimensional nature of ET, involving significant cerebral alterations.