Persistent functional deficit in multiple sclerosis and autosomal dominant cerebellar ataxia is associated with axon loss

Brain : a Journal of Neurology
C A DavieD H Miller

Abstract

Proton magnetic resonance spectroscopy (MRS) and MRI were carried out in 11 patients with multiple sclerosis who had clinical evidence of severe cerebellar involvement, 11 multiple sclerosis patients (of similar age and disease duration) who had minimal or no signs of cerebellar disease, eight patients with autosomal dominant cerebellar ataxia (ADCA) and 11 healthy controls. In all subjects MRS was localized to cerebellar white matter (volumes of interest 3-6 ml). Apparent metabolite concentrations were calculated using the fully relaxed water spectrum as an internal standard of reference. The patients also underwent MRI to assess cerebellar volume and (in the two multiple sclerosis groups) lesion volume within the posterior fossa. Magnetic resonance spectroscopy from cerebellar white matter showed a highly significant reduction in the concentration of N-acetyl groups (NA) [which consists predominantly of N-acetylaspartate (NAA), a neuronal marker] in the multiple sclerosis group with cerebellar deficit compared with the multiple sclerosis group with minimal or no signs of cerebellar involvement, and healthy controls. Follow-up MRS performed in six of the multiple sclerosis patients 9 months later showed no change in the median...Continue Reading

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