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© 2003 American Academy of Neurology Focal right inferotemporal atrophy in AD with disproportionate visual constructive impairmentFrom the Memory and Aging Center (Drs. Boxer, Kramer, Miller, and Rosen), Department of Neurology, University of California at San Francisco; and Magnetic Resonance Unit (Drs. Du, Schuff, and Weiner), San Francisco Veteran’s Administration Hospital. Address correspondence and reprint requests to Dr. Boxer, UCSF Department of Neurology, Memory and Aging Center, Box 1207, San Francisco, CA 94143-1207; e-mail: adam.boxer{at}memory.ucsf.edu Objective: To explore the structural neuroimaging correlates of visual constructive impairment in patients with mild to moderate Alzheimer disease (AD). Background: There is considerable heterogeneity in the non-memory cognitive deficits associated with AD. Structural neuroimaging with MRI is an important diagnostic tool that is gaining acceptance as a surrogate measure of brain pathology in AD treatment trials. Most MRI measurements have focused on medial temporal lobe or global cortical atrophy, which may not reflect some important clinical features of AD. Methods: Thirty-two patients with probable AD were stratified into two groups based on their relative performance on a visual constructive task, the copy of a modified Rey-Osterrieth figure (Rey). The two groups did not differ in basic demographic features or in neuropsychological performance, other than on the visual constructive task. MRI measurements of hippocampal volume, cortical gray matter volume, and focal cortical gray matter loss were performed in the patients and a group of 71 age-matched, normal controls. Results: Both groups showed significant, bilateral hippocampal as well as cortical gray matter volume loss relative to controls. The more spatially impaired AD group (SAD) had more right than left cortical gray matter loss, whereas the opposite was true in the less spatially impaired group (NSAD). The SAD group had significantly less gray matter in the right inferior temporal gyrus relative to the NSAD group. Atrophy of this region was correlated with performance on the Rey task in all patients with AD. Conclusions: Right inferotemporal atrophy may serve as a neuroimaging marker of visual constructive impairment in mild to moderate AD. Heterogeneous cortical atrophy is a common feature of AD.
Received April 28, 2003. Accepted in final form June 30, 2003. This article has been cited by other articles:
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