Imaging studies have shown differing results which probably represents the heterogeneity of language problems than can occur in PNFA. However, classically atrophy of left perisylvian areas is seen. Comprehensive meta-analyses on MRI and FDG-PET studies identified alterations in the whole left frontotemporal network for phonological and syntactical processing as the most consistent finding. Based on these imaging methods,<unk>  can be regionally dissociated from the other subtypes of frontotemporal lobar degeneration, frontotemporal dementia and semantic dementia. Classification Some confusion exists in the terminology used by different neurologists. Mesulam's original description in 1982 of<unk>  language problems caused by neurodegenerative disease (which he called primary<unk>  aphasia (PPA) included patients with<unk> , semantic dementia, and logopenic<unk>  aphasia.
Progressive nonfluent aphasia
Global aphasia
Anomic aphasia
Expressive aphasia
Receptive aphasia
Social-emotional agnosia
Visuospatial dysgnosia
Hemispatial neglect