Surface-based morphometry of the anterior cingulate cortex in first episode schizophrenia.

Area of Science:

• Neuroimaging
• Psychiatry
• Neuroscience

Background:

• The anterior cingulate cortex (ACC) is implicated in schizophrenia pathophysiology.
• Previous MRI studies were limited by coarse metrics and lack of appreciation for ACC's anatomical diversity.

Purpose of the Study:

• To investigate detailed morphometric changes in the ACC in first-episode schizophrenia using a novel surface-based approach.
• To overcome limitations of traditional volume-based morphometry in schizophrenia research.

Main Methods:

• Applied a surface-based analysis to T1-weighted MRI scans from 40 first-episode schizophrenia patients and 40 matched healthy controls.
• Calculated regional grey matter volume, surface area, curvature, cortical thickness, and cingulate sulcus depth with sub-millimeter precision.
• Matched participants for age, sex, and paracingulate sulcus morphology to control for anatomical variations.

Main Results:

• Schizophrenia patients exhibited bilateral reduction in ACC paralimbic cortical thickness.
• A concomitant increase in surface area was observed in both limbic and paralimbic ACC regions in patients.
• No significant differences were found in regional grey matter volume, surface curvature, or cingulate sulcus depth.

Conclusions:

• Early-stage schizophrenia is associated with specific ACC abnormalities in thickness and surface area, not just volume.
• Surface-based morphometry offers superior precision for detecting subtle cortical changes compared to traditional methods.
• These ACC alterations in schizophrenia are independent of variations in major sulcal and gyral patterns.