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Progressive nonfluent aphasia is a form of primary progressive aphasia characterized by apraxia of speech and deficits in processing complex syntax. It is similar to Broca's aphasia and is associated with left inferior frontal and insular atrophy.
Progressive nonfluent aphasia is one of three clinical syndromes associated with frontotemporal lobar degeneration. Thus, some cases are thought to be caused by either Pick's disease or dementia lacking distinctive histology. However, many cases may have neither of these types of pathology and are thought to result instead from corticobasal degeneration.
- Neary D, Snowden JS, Gustafson L, Passant U, Stuss D, Black S, Freedman M, Kertesz A, Robert PH, Albert M, Boone K, Miller BL, Cummings J, Benson DF. "Frontotemporal lobar degeneration: a consensus on clinical diagnostic criteria." Neurology (1998) 51(6):1546-54. Available: 
- Gorno-Tempini ML, Dronkers NF, Rankin KP, Ogar JM, Phengrasamy L, Rosen HJ, Johnson JK, Weiner MW, Miller BL. "Cognition and anatomy in three variants of primary progressive aphasia." Ann Neurol. (2004) 55(3):335-46.
- Frontotemporal lobar degeneration
- Frontotemporal dementia
- Semantic dementia
- Pick's disease
- Alzheimer's disease
- Corticobasal degeneration
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