Callosal atrophy with reduced cortical oxygen metabolism in carotid artery disease.

In cerebrovascular disease, brain atrophy may be a reflection of ischemic changes. Minor changes that are not detectable as infarction on computed tomography may result in atrophy with metabolic depression. We evaluated the relation between size of the corpus callosum and cerebral cortical oxygen metabolism in carotid artery disease.We used magnetic resonance imaging and positron emission tomography to evaluate 13 right-handed male patients with transient ischemic attacks or minor strokes and unilateral internal carotid artery occlusive disease, two with stenosis and 11 with occlusion. Computed tomography showed only minor subcortical abnormalities in the affected hemisphere. Midsagittal corpus callosum areas on T1-weighted magnetic resonance images, white matter lesions on T2-weighted images, and the cerebral metabolic rate of oxygen measured by the oxygen-15 steady-state technique were analyzed.Compared with 13 age- and sex-matched control subjects showing the same degree of white matter areas of high i...