Gray matter differences between pediatric obsessive-compulsive disorder patients and high-risk siblings: a...

Area of Science:

• Neuroimaging
• Neuropsychiatry
• Brain Imaging

Background:

• Frontostriatal circuitry alterations are noted in obsessive-compulsive disorder (OCD).
• Voxel-based morphometry (VBM) enables whole-brain gray matter density assessment.
• Previous VBM studies have not focused on pediatric OCD patients and their siblings.

Purpose of the Study:

• To investigate regional gray matter density differences in pediatric OCD patients, their unaffected siblings, and healthy controls using VBM.
• To identify specific brain regions associated with OCD in a pediatric population.

Main Methods:

• Volumetric magnetic resonance imaging (MRI) was performed on 10 pediatric OCD patients, 10 unaffected siblings, and 10 healthy controls.
• Voxel-based morphometry (VBM) analysis was conducted using SPM2.
• Statistical comparisons utilized the general linear model with small volume corrections for anterior cingulate cortex (ACC), striatum, and thalamus.

Main Results:

• OCD patients exhibited significantly lower gray matter density in the left ACC and bilateral medial superior frontal gyrus (SFG) compared to healthy controls.
• A significantly greater gray matter density in the right putamen was observed in OCD patients compared to their unaffected siblings.
• Preliminary findings suggest structural gray matter differences in individuals with OCD and those at risk.

Conclusions:

• Pediatric OCD is associated with distinct gray matter density alterations in frontostriatal regions.
• VBM is a valuable tool for detecting regional brain differences in pediatric OCD and identifying individuals at risk.
• These findings contribute to understanding the neurobiological underpinnings of OCD in youth.