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Brain, Vol. 124, No. 5, 882-892, May 2001
© 2001 Oxford University Press

Neuropathological abnormalities in schizophrenia: evidence from magnetization transfer imaging

J. Foong1, M. R. Symms1, G. J. Barker1, M. Maier2, F. G. Woermann3, D. H. Miller1 and M. A. Ron1

1 NMR Research Unit, Institute of Neurology, 2 Imperial College School of Medicine, Charing Cross Campus, London, UK and 3 Department of Psychiatry, Gilead Hospital and MRI Unit, Mara Hospital, Bielefeld, Germany

Correspondence to: Dr J. Foong, Department of Neuropsychiatry, The National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK E-mail: j.foong@ion.ucl.ac.uk

Post-mortem and structural brain imaging studies in schizophrenia have reported macroscopic changes such as global and regional cortical volume reductions, but it has been more difficult to characterize the histopathological changes that underlie these abnormalities. Magnetization transfer imaging (MTI), a novel MRI technique, more sensitive to subtle or early neuropathological changes than conventional MRI, provides a quantitative measure of macromolecular structural integrity represented by the magnetization transfer ratio (MTR). In this study, we used MTI to examine 25 patients with schizophrenia compared with 30 age-matched controls. A voxel-based analysis of the MTR maps revealed widespread MTR reductions in the cortex unrelated to volume reduction, predominantly in the frontal and temporal regions, in the schizophrenic patients when compared with controls. MTR reductions in bilateral parieto-occipital cortex and the genu of the corpus callosum were associated with the severity of negative symptoms in the schizophrenic patients. However, MTR changes were not related to other clinical variables of age, duration of illness and current dose of antipsychotic medication. This study demonstrates that MTR abnormalities in the cortex can be detected in chronic schizophrenia that may reflect subtle neuropathological changes involving neurones or neuronal processes. Longitudinal studies are needed to determine whether these abnormalities are related to disease progression or other disease manifestations such as cognitive changes.


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