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These findings provide evidence of smaller globus pallidus volume in patients with OCD without the potentially confounding effects of prior psychotropic drug exposure. Volumetric abnormalities in the anterior cingulate gyrus appear specific to the gray matter in OCD, at least at the gross anatomic level, and are consistent with findings of functional neuroimaging studies that have reported anterior cingulate hypermetabolism in the disorder.

These results suggest that alterations in amygdala:hippocampal volume ratios in pediatric MDD may more reflect severity of associated anxiety than depression. These results underscore the importance of assessment for comorbidity in the study of MDD.

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