PGRN mutations at 17q21 may occur in apparently sporadic frontotemporal lobar dementia with ubiquitinated inclusions cases and in cases presenting with either primary progressive aphasia or the behavioral variant of frontotemporal dementia. Some cases without PGRN mutations also have ubiquitinated neuronal intranuclear inclusions. Clinicopathologic differences are observed among individuals with and without PGRN mutations.
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