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Differences and Similarities in Insular and Temporal Pole MRI Gray Matter Volume Abnormalities in First-Episode Schizophrenia and Affective Psychosis
Kiyoto Kasai, MD;
Martha E. Shenton, PhD;
Dean F. Salisbury, PhD;
Toshiaki Onitsuka, MD, PhD;
Sarah K. Toner, BA;
Deborah Yurgelun-Todd, PhD;
Ron Kikinis, MD;
Ferenc A. Jolesz, MD;
Robert W. McCarley, MD
Arch Gen Psychiatry. 2003;60:1069-1077.
Context Whether psychoses associated with schizophrenia and affective disorder represent manifestations of different disorders or the same disorder is an important but unresolved question in psychiatry. Results of previous volumetric magnetic resonance imaging investigations indicate that gray matter volume reductions in neocortical regions may be specific to schizophrenia.
Objective To simultaneously evaluate multiple olfactocentric paralimbic regions, which play crucial roles in human emotion and motivation, in first-episode patients with schizophrenia and affective psychosis.
Design A cross-sectional study using high–spatial resolution magnetic resonance imaging in patients with schizophrenia and affective psychosis at their first hospitalization.
Setting Inpatient units at a private psychiatric hospital.
Participants Fifty-three first-episode patients, 27 with schizophrenia and 26 with affective (mainly manic) psychosis, and 29 control subjects.
Main Outcome Measures Using high–spatial resolution magnetic resonance imaging, the gray matter volumes of 2 olfactocentric paralimbic regions of interest, the insular cortex and the temporal pole, were evaluated.
Results A bilateral volume reduction in insular cortex gray matter was specific to first-episode patients with schizophrenia. In contrast, both first-episode psychosis groups showed a volume reduction in left temporal pole gray matter and an absence of normal left-greater-than-right asymmetry. Region of interest correlations showed that only patients with schizophrenia lacked a positive correlation between left temporal pole and left anterior amygdala-hippocampal complex gray matter volumes, whereas both psychosis groups were similar in lacking normal positive correlations between left temporal pole and left anterior superior temporal gyrus gray matter volumes.
Conclusions These partially different and partially similar patterns of structural abnormalities in olfactocentric paralimbic regions and their associated abnormalities in other temporolimbic regions may be important factors in the differential and common manifestations of the 2 psychoses.
From the Clinical Neuroscience Division, Laboratory of Neuroscience, Department of Psychiatry, Boston Veterans Affairs Healthcare System, Brockton Division, Harvard Medical School, Brockton, Mass (Drs Kasai, Shenton, Salisbury, Onitsuka, and McCarley and Ms Toner); the Surgical Planning Laboratory, MRI Division, Brigham and Women's Hospital, and the Department of Radiology, Harvard Medical School, Boston, Mass (Drs Shenton, Kikinis, and Jolesz); and the Cognitive Neuroscience Laboratory (Dr Salisbury) and the Brain Imaging Center (Dr Yurgelun-Todd), McLean Hospital, Belmont, Mass.
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