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Cerebellar Glucose Consumption in Normal and Pathologic States Using Fluorine-FDG and PET

Cerebrovascular Research Center, Departments of Neurology and Radiology and Department of Internal Medicine, University of Pennsylvania, Philadelphia, Pennsylvania

Correspondence: For reprints contact: Michael Kushner, MD, Cerebrovascular Research Center, Rm. 429 Johnson Pavilion, 36th and Hamilton Walk, University of Pennsylvania, Philadelphia, PA 19104.

ABSTRACT

We studied cerebellar metabolism in 118 subjects including young and elderly controls and patients suffering from stroke, supratentorial brain tumor and Alzheimer's disease using fluorine-18 fluorodeoxyglucose ([¹⁸F]FDG) and position emission tomography (PET). Alzheimer's disease and normal aging did not alter mean cerebellar metabolism. In stroke and tumor mean cerebellar metabolism was lower in the hemisphere contralateral to the supratentorial lesion. In tumor bilaterally significant reductions in absolute cerebellar metabolism also were noted, unlike stroke. Primary sensory stimulation did not alter absolute or relative cerebellar metabolism. These results show that absolute and relative values for cerebellar metabolism vary depending on the process under study. Thus analysis schemes employing normalization of regional metabolic data to cerebellar values may be subject to error.

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