White matter microstructure in patients with obsessive-compulsive disorder.

Area of Science:

• Neuroimaging
• Neuroscience
• Psychiatry

Background:

• Previous diffusion tensor imaging (DTI) studies in obsessive-compulsive disorder (OCD) have yielded inconsistent results.
• It remains unclear if these findings relate to axonal structure or myelination abnormalities.

Purpose of the Study:

• To investigate microstructural white matter abnormalities in OCD using DTI.
• To differentiate between axonal and myelin-related changes in OCD patients.

Main Methods:

• Diffusion tensor imaging (DTI) was employed.
• Key metrics analyzed included fractional anisotropy, axial diffusivity, and radial diffusivity.
• The study included 21 patients diagnosed with OCD and 29 healthy controls.

Main Results:

• Patients with OCD exhibited reduced fractional anisotropy in the corpus callosum's body.
• This reduction was associated with increased radial diffusivity, indicating altered myelination.
• Axial diffusivity showed no significant differences between groups.

Conclusions:

• The findings suggest abnormal myelination in the corpus callosum of individuals with OCD.
• Increased radial diffusivity provides preliminary evidence supporting myelin-related alterations.
• A cross-sectional design was a primary limitation of this study.