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Abstract

Objective: To assess whether different patterns of regional gray matter loss in patients with mild cognitive impairment (MCI) are associated with different risks of conversion to Alzheimer disease (AD), using MRI and voxel-based morphometry (VBM).
Methods: The authors recruited 22 patients with MCI, 22 patients with probable AD, and 20 healthy subjects (HS). T1 volumes from each subject were postprocessed according to an optimized VBM protocol. All patients were clinically followed up (mean [SD] time = 28.7 [5.7] months), and patients with MCI were reclassified into two groups (converters and nonconverters to AD).
Results: When comparing patients with AD to HS, widespread areas of reduced gray matter density were found predominantly in temporal, frontal, and parietal lobes and in the insula. Comparing MCI converters and nonconverters with HS, the converters showed more widespread areas of reduced gray matter density than nonconverters, with a pattern of abnormalities similar to that seen in patients with AD. Conversely, when comparing the same groups with patients with AD, MCI nonconverters showed a pattern of gray matter density similar to that of HS. Areas of decreased gray matter density were also found in MCI converters compared with nonconverters.
Conclusions: Different patterns of gray matter density distribution in patients with mild cognitive impairment may be associated to different rates of conversion to Alzheimer disease.

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Published In

Neurology®
Volume 67Number 3August 8, 2006
Pages: 453-460
PubMed: 16894107

Publication History

Published online: August 7, 2006
Published in print: August 8, 2006

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Authors

Affiliations & Disclosures

M. Bozzali, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
M. Filippi, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
G. Magnani, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
M. Cercignani, MPhil
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
M. Franceschi, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
E. Schiatti, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
S. Castiglioni, Psych
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
R. Mossini, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
M. Falautano, Psych
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
G. Scotti, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
G. Comi, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).
A. Falini, MD
From the Neuroimaging Research Unit (M.B., M. Filippi, M.C.), Department of Neurology (M. Filippi, G.M., E.S., R.M., M. Falautano, G.C.), and Department of Neuroradiology, CERMAC (G.S., A.F.), Scientific Institute and University Ospedale San Raffaele, Milan, Italy; Wellcome Department of Imaging Neuroscience (M.B.) and NMR Research Unit (M.C.), Institute of Neurology, University College of London, London, UK; and Department of Neurology, Multimedica-SantaMaria, Castellanza, Italy (M. Franceschi, S.C.).

Notes

Address correspondence and reprint requests to Dr. Marco Bozzali, Wellcome Department of Imaging Neuroscience, Institute of Neurology, University College of London, 12 Queen Square, WC1N 3BG London, UK; e-mail: [email protected]

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