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Mood disorders – review of structural MRI studies

Published online by Cambridge University Press:  24 June 2014

E. Serap Monkul ,
Gin S. Malhi  and
Jair C. Soares
E. Serap Monkul
Affiliation:
Division of Mood and Anxiety Disorders, Department of Psychiatry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA South Texas VA Health Care System, Audie L. Murphy Division, San Antonio, TX, USA Department of Psychiatry, Dokuz Eylül University School of Medicine, Izmir, Turkey
Gin S. Malhi
Affiliation:
Mood Disorders Unit, The University of New South Wales, Sydney, Australia
Jair C. Soares*
Affiliation:
Division of Mood and Anxiety Disorders, Department of Psychiatry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA South Texas VA Health Care System, Audie L. Murphy Division, San Antonio, TX, USA Department of Radiology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
*
Jair C. Soares MD, Division of Mood and Anxiety Disorders, Department of Psychiatry, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229, USA. Tel: (210) 567-5492; Fax: (210) 567-3759; E-mail: soares@uthscsa.edu
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Abstract

Background:

Mood disorders are related to considerable morbidity and mortality, and although there is little doubt that they are brain-based disorders, their neural correlates still remain elusive. A neuro-anatomic model of mood regulation comprising the prefrontal cortex, amygdala-hippocampus complex, thalamus, basal ganglia, and connections among these areas has been proposed.

Objective:

We reviewed the evidence for regional brain abnormalities in bipolar disorder, and attempted to integrate available findings into a comprehensive pathophysiological model of illness.

Methods:

A computerized Medline Ovid search was conducted for the period 1966–2002, and complemented by a manual search of bibliographical references from recent reviews. Articles meeting specified criteria were included.

Results:

Hyperintense lesions in cortical and subcortical regions are the most consistently reported and widely studied structural abnormalities. Smaller prefrontal cortical volume is a common finding in bipolar disorder and unipolar depression. Enlarged amygdala (in bipolar disorder) and smaller hippocampus (in unipolar depression) have been reported by several groups. Decreased volumes (in unipolar depression) and increased or unaltered volumes (in bipolar disorder) of striatal structures have been reported.

Conclusions:

Bipolar and unipolar mood disorders are associated with detectable structural brain abnormalities. The histopathology underlying such anatomical changes remains to be elucidated. To reach more definitive conclusions about neuroanatomical changes that take place during the course of mood disorders, prospective longitudinal studies are needed. Also, integration with functional imaging is necessary in order to elucidate the relevance of identified structural abnormalities.

Keywords

bipolar disorderdepressionmagnetic resonance imagingmood disordersstructural

Information

Type
Research Article
Information
Acta Neuropsychiatrica , Volume 15 , Issue 6 , December 2003 , pp. 368 - 380
Copyright
Copyright © 2003 Blackwell Munksgaard

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