Corticobasal Degeneration and Frontotemporal Dementia Presentations in a Kindred with Nonspecific Histopathology

We report the clinical, neuropsychological, electroencephalographic and radiologic findings in a kindred with varying clinical presentations of a neurodegenerative disorder. Postmortem examination of one member with clinically suspected corticobasal degeneration (CBD) revealed nonspecific histopathology maximally involving the frontoparietal cortex with negligible degenerative changes in the basal ganglia and substantia nigra. The findings in this and other kindreds demonstrate that (1) similar findings on ancillary testing can occur in relatives presumably suffering from the same pathophysiologic process despite dissimilar clinical presentations, (2) the ‘CBD syndrome’ is not specific for CBD, (3) extrapyramidal dysfunction can exist in the absence of appreciable basal ganglia and nigral degeneration, (4) nonspecific histopathology can underlie familial focal/asymmetric cortical degeneration syndromes and (5) many of the findings in CBD are comparable to those reported in frontotemporal dementia.

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