Neurological and neuropathologic heterogeneity in two brothers with cobalamin C deficiency
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Updated: Oct 9, 2026

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
Published on: June 3, 2020
J M Powers1, D S Rosenblatt, R E Schmidt
1University of Rochester Medical Center, Department of Pathology, Rochester, NY 14642, USA. jamespowers@urmc.rochester.edu
Abstract:
Two adult brothers, one documented to have methylmalonic acidemia with homocystinuria, or cobalamin C deficiency, after autopsy, displayed severe but divergent neurological presentations. One exhibited a myelopathy and the other chronic endocrine problems (Schmidt's syndrome) followed by a neuropsychiatric and dementing disorder owing to cerebral perivascular demyelination. The recognition of cobalamin C deficiency has practical implications because it is one of the few inherited diseases of central white matter that is treatable.
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