title: Distinct regional anatomic and functional correlates of neurodegenerative apraxia of speech and aphasia: an MRI and FDG-PET study.
abstract: Progressive apraxia of speech (AOS) can result from neurodegenerative disease and can occur in isolation or in the presence of agrammatic aphasia. We aimed to determine the neuroanatomical and metabolic correlates of progressive AOS and aphasia. Thirty-six prospectively recruited subjects with progressive AOS or agrammatic aphasia, or both, underwent the Western Aphasia Battery (WAB) and Token Test to assess aphasia, an AOS rating scale (ASRS), 3T MRI and 18-F fluorodeoxyglucose (FDG) PET. Correlations between clinical measures and imaging were assessed. The only region that correlated to ASRS was left superior premotor volume. In contrast, WAB and Token Test correlated with hypometabolism and volume of a network of left hemisphere regions, including pars triangularis, pars opercularis, pars orbitalis, middle frontal gyrus, superior temporal gyrus, precentral gyrus and inferior parietal lobe. Progressive agrammatic aphasia and AOS have non-overlapping regional correlations, suggesting that these are dissociable clinical features that have different neuroanatomical underpinnings.
authors.affiliation: Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA. Whitwell.jennifer@mayo.edu
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Whitwell
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Duffy
authors.forename: Edythe A
authors.initials: EA
authors.lastname: Strand
authors.forename: Rong
authors.initials: R
authors.lastname: Xia
authors.forename: Jay
authors.initials: J
authors.lastname: Mandrekar
authors.forename: Mary M
authors.initials: MM
authors.lastname: Machulda
authors.forename: Matthew L
authors.initials: ML
authors.lastname: Senjem
authors.forename: Val J
authors.initials: VJ
authors.lastname: Lowe
authors.forename: Clifford R
authors.initials: CR
authors.lastname: Jack
authors.forename: Keith A
authors.initials: KA
authors.lastname: Josephs
mesh_terms: D000368:Aged; D001037:Aphasia / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology*; D001072:Apraxias / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology*; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007807:Language Tests; D008279:Magnetic Resonance Imaging; D008297:Male; D019636:Neurodegenerative Diseases / Q000150:complications / Q000000981:diagnostic imaging / Q000473:pathology*; D009483:Neuropsychological Tests; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18
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