Abstract
Introduction
Adult-onset ADLD with autonomic symptoms is a rare disease with a clinical course somewhat similar to chronic progressive MS but with different imaging findings consisting of extensive white matter changes in the cerebrum and cerebellar peduncles. Patients usually present in the fourth to sixth decade with autonomic symptoms, manifesting later symptoms from the pyramidal tracts and ataxia. Here, we present magnetic resonance spectroscopy (MRS) findings in this disease.
Methods
Fourteen subjects, from two non-related families, with genetic linkage to the disease were studied with magnetic resonance imaging and single-voxel MRS. Clinically, they ranged from asymptomatic to wheelchair-using. Their results were compared to those of age- and sex-matched healthy controls.
Results
One MRS was excluded due to suboptimal quality. The remaining 13 subjects manifested characteristic evidence of pathology on MRI, 11 of them exhibited extensive changes. The metabolite concentrations of total Cr, total Cho, and total NAA measured in millimolars, using internal water as a reference, were significantly lower in these 11 subjects compared to controls, and we found linear correlations between all these metabolite levels. When total Cr was used as a reference, we found no difference between subjects and controls. No lactate was detected.
Conclusion
The decreased metabolite concentrations measured using internal water as a reference are most likely due to increased water content in the tissues, diluting all metabolites to a similar degree. This is also in agreement with the high signal intensity exhibited in the white matter on T2-weighted MR images and with the reported histopathological findings of vacuolated myelin.
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Acknowledgments
This study was supported by grants from the Ländell Foundation, Selander Foundation, Hedberg Foundation for Medical Research and the Swedish Medical Research Council Grant 73X-13158.
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We declare that we have no conflict of interest.
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Finnsson, J., Melberg, A. & Raininko, R. 1H-MR spectroscopy of adult-onset autosomal dominant leukodystrophy with autonomic symptoms. Neuroradiology 55, 933–939 (2013). https://doi.org/10.1007/s00234-013-1174-5
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DOI: https://doi.org/10.1007/s00234-013-1174-5