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An In Vivo Magnetic Resonance Imaging Study

Charles-André Cuénod, MD; Alban Denys, MD; Jean-Luc Michot, PhD; Philippe Jehenson, MD, PhD; Françoise Forette, MD; David Kaplan; André Syrota, MD, PhD; François Boller, MD, PhD

Arch Neurol. 1993;50(9):941-945.

Abstract
• Objectives.
—To study the ability of magnetic resonance imaging to measure the volume of the amygdala and detect amygdala atrophy in patients with early Alzheimer's disease.

Design.
—Prospective case-control study and "blind" measurements.

Setting.
—Subjects were ambulatory outpatients selected from an institutional practice in Paris, France.

Patients.
—We studied 11 patients with probable Alzheimer's disease according to National Institute of Neurologic and Communicative Disorders and Stroke/Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) and Consortium to Establish a Registry for Alzheimer's Disease (CERAD) inclusion and exclusion criteria, as well as six age-matched control subjects.

Intervention.
—None.

Main Outcome Measure.
—A 1.5-T magnetic resonance imager was used to acquire the images. Two neuroradiologists independently and blindly measured the volume of the right and left amygdalas on high-resolution contiguous slices. In addition, other cerebral structures, ie, the sylvian fissures, temporal lobes, lateral and third ventricles, corpus callosum, and hippocampal formation, were measured on a single slice.

Results.
—The values obtained by the two observers correlated highly (r=.90), and interrater variability was 13%. The Alzheimer's disease group showed significant (33%, P<.0001) atrophy of the amygdala when compared with the control group. The other structures showed less variation.

Conclusion.
—Significant amygdala atrophy can be detected in vivo in patients with early Alzheimer's disease by means of standard magnetic resonance imaging. This technique may be useful in the early diagnosis of Alzheimer's disease.

Author Affiliations
From the Frédéric-Joliot Hospital, Atomic Energy Commission, Orsay France (Drs Cuénod, Denys, Jehenson, and Syrota and Mr Kaplan); the National Institute of Health and Medical Research (INSERM) Unit 324, Paris, France (Drs Cuénod, Michot, Forette, and Boiler and Mr Kaplan); and Broca Hospital, Paris (Dr Forette).

Footnotes
Accepted for publication January 19, 1993.

Presented in part at the 44th Annual Meeting of the American Academy of Neurology, San Diego, Calif, May 5, 1992.

Reprint requests to INSERM Unité 324, 2 ter rue d'Alésia, 75014 Paris, France (Dr Boiler).

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