Primary dystonia: conceptualizing the disorder through a structural brain imaging lens

Area of Science:

• Neuroscience
• Movement Disorders
• Neuroimaging

Background:

• Dystonia is a hyperkinetic movement disorder causing involuntary, repetitive twisting movements.
• The precise anatomical structures and neurophysiological mechanisms underlying dystonia remain unclear.
• Key concepts include abnormal surround inhibition, maladaptive plasticity, and impaired sensorimotor integration.

Purpose of the Study:

• To review the application of high-resolution structural brain imaging techniques in primary torsion dystonia.
• To evaluate brain changes associated with dystonia using voxel-based morphometry (VBM) and diffusion tensor imaging (DTI).
• To explore the relationship between observed brain changes and the disorder's pathophysiology.

Main Methods:

• A comprehensive literature search was conducted using PubMed.
• Focus on studies employing voxel-based morphometry (VBM) and diffusion tensor imaging (DTI).

Main Results:

• VBM and DTI studies yielded varied results regarding gray matter volume and white matter integrity across dystonia types.
• Despite discrepancies, imaging consistently identified abnormalities beyond the basal ganglia.
• Affected areas include the sensorimotor cortex and cerebellum.

Conclusions:

• Structural MRI, functional imaging, and neurophysiology are beginning to link structural and functional brain abnormalities in dystonia.
• Findings suggest involvement of basal ganglia, cortical, and cerebellar networks.
• Further cross-disciplinary research is needed to explore genetic and environmental factors in dystonia.