Abstract
Objective
To define the neuropsychological and neuroimaging characteristics of classical infratentorial superficial siderosis (iSS), a rare but disabling disorder defined by hemosiderin deposition affecting the superficial layers of the cerebellum, brainstem and spinal cord, usually associated with a slowly progressive neurological syndrome of deafness, ataxia and myelopathy.
Methods
We present the detailed neuropsychological and neuroimaging findings in 16 patients with iSS (mean age 57 years; 6 female).
Results
Cognitive impairment was present in 8/16 (50%) of patients: executive dysfunction was the most prevalent (44%), followed by impairment of visual recognition memory (27%); other cognitive domains were largely spared. Disease symptom duration was significantly correlated with the number of cognitive domains impaired (r = 0.59, p = 0.011). Mood disorders were also common (anxiety 62%, depression 38%, both 69%) but not associated with disease symptom duration. MRI findings revealed siderosis was not only in infratentorial brain regions, but also in characteristic widespread symmetrical supratentorial brain regions, independent of disease duration and degree of cognitive impairment. The presence of small vessel disease markers was very low and did not account for the cognitive impairment observed.
Conclusion
Neuropsychological disturbances are common in iSS and need to be routinely investigated. The lack of association between the anatomical extent of hemosiderin and cognitive impairment or disease duration suggests that hemosiderin itself is not directly neurotoxic. Additional biomarkers of iSS disease severity and progression are needed for future research and clinical trials.
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Anonymized data supporting the findings of this study will be made available to appropriately qualified investigators on request.
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Funding
This work was undertaken at UCLH/UCL, which received a proportion of funding from Department of Health’s National Institute for Health Research Biomedical Research Centre’s funding scheme.
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This study included anonymised data collected as part of standard care, in accordance with a Service Evaluation Agreement approved by the local Research Ethics Committee (National Hospital for Neurology and Neurosurgery).
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Chan, E., Sammaraiee, Y., Banerjee, G. et al. Neuropsychological and neuroimaging characteristics of classical superficial siderosis. J Neurol 268, 4238–4247 (2021). https://doi.org/10.1007/s00415-021-10548-z
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DOI: https://doi.org/10.1007/s00415-021-10548-z