No brain structure abnormalities in boys with Tourette's syndrome: a voxel-based morphometry study

Area of Science:

• Neuroimaging
• Neurology
• Developmental Neuroscience

Background:

• Morphometric findings in Tourette syndrome (TS) are inconsistent.
• Potential confounders include psychiatric comorbidities, medication status, and age-related compensatory changes.
• Previous studies often lack well-defined, treatment-naïve patient cohorts.

Purpose of the Study:

• To investigate brain morphometric changes in a carefully selected group of drug-naïve boys with "pure" Tourette syndrome.
• To identify potential structural alterations in the brain, excluding confounding variables.
• To clarify discrepancies in existing neuroimaging research on Tourette syndrome.

Main Methods:

• Voxel-based morphometry (VBM) analysis of high-resolution structural MRI scans.
• Comparison between 38 drug-naïve boys with "pure" Tourette syndrome and 38 age- and IQ-matched healthy controls.
• Exclusion of participants with coexisting psychiatric conditions and prior medication history.

Main Results:

• Voxel-based morphometry analyses revealed no significant differences in brain morphology between the Tourette syndrome group and the healthy control group.
• No evidence of altered brain structure was found in treatment-naïve boys with "pure" Tourette syndrome.
• The study controlled for potential confounders such as medication and psychiatric comorbidities.

Conclusions:

• Brain morphology does not appear to be altered in boys with "pure" Tourette syndrome.
• Inconsistent previous findings may be attributed to confounding factors like psychiatric comorbidities or long-term tic suppression.
• Further research is needed to elucidate the precise neurobiological underpinnings of Tourette syndrome.