Clinical, neuroimaging, and pathologic features of progressive nonfluent aphasia

Annals of Neurology
R S TurnerM Grossman

Abstract

We report the clinical, neuroimaging, and neuropathologic features of progressive nonfluent aphasia (PNFA), a rare neurodegenerative syndrome most notable for its distinct language disturbance. Longitudinal observations of 3 patients revealed progressively telegraphic speech and writing, followed by gradual deterioration of sentence comprehension, and finally, preterminal mutism and dementia. Magnetic resonance imaging revealed cortical atrophy most pronounced in anterior regions of the left hemisphere. Functional neuroimaging demonstrated reduced cerebral activity most prominently in left frontal and temporal regions. At necropsy, microscopic pathology of brain was most consistent with the diagnosis of "dementia lacking distinctive histology" (DLDH). A review of published primary progressive aphasia cases with adequate clinical and histopathological descriptions reveals that the most common pathology underlying PNFA is DLDH. PNFA is one example of a family of clinical syndromes with similar underlying histopathology that affects different regions of the frontal lobe.

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