title: Anatomical differences between CBS-corticobasal degeneration and CBS-Alzheimer's disease.
abstract: We compare patterns of gray matter loss on MRI in subjects presenting as corticobasal syndrome (CBS) with Alzheimer disease pathology (CBS-AD) to those presenting as CBS with corticobasal degeneration pathology (CBS-CBD). Voxel-based morphometry was used to compare patterns of gray matter loss in pathologically confirmed CBS-AD subjects (n = 5) and CBS-CBD subjects (n = 6) to a group of healthy controls (n = 20), and to each other. Atlas based parcellation using the automated anatomic labeling atlas was also utilized in a region-of-interest analysis to account for laterality. The CBS-AD subjects were younger at the time of scan when compared with CBS-CBD subjects (median: 60 years vs. 69; P = 0.04). After adjusting for age at time of MRI scan, the CBS-AD subjects showed loss in posterior frontal, temporal, and superior and inferior parietal lobes, while CBS-CBD showed more focal loss predominantly in the posterior frontal lobes when compared with controls. In both CBS-AD and CBS-CBD groups, there was basal ganglia volume loss, yet relative sparing of hippocampi. On direct comparisons between the two subject groups, CBS-AD showed greater loss in both temporal and inferior parietal cortices than CBS-CBD. No regions showed greater loss in the CBS-CBD group compared to the CBS-AD group. These findings persisted when laterality was taken into account. In subjects presenting with CBS, prominent temporoparietal, especially posterior temporal and inferior parietal, atrophy may be a clue to the presence of underlying AD pathology.
authors.affiliation: Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905, USA. josephs.keith@mayo.edu
authors.forename: Keith A
authors.initials: KA
authors.lastname: Josephs
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Whitwell
authors.forename: Bradley F
authors.initials: BF
authors.lastname: Boeve
authors.forename: David S
authors.initials: DS
authors.lastname: Knopman
authors.forename: Ronald C
authors.initials: RC
authors.lastname: Petersen
authors.forename: William T
authors.initials: WT
authors.lastname: Hu
authors.forename: Joseph E
authors.initials: JE
authors.lastname: Parisi
authors.forename: Dennis W
authors.initials: DW
authors.lastname: Dickson
authors.forename: Clifford R
authors.initials: CR
authors.lastname: Jack
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000473:pathology*; D001479:Basal Ganglia / Q000473:pathology*; D001480:Basal Ganglia Diseases / Q000473:pathology*; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000473:pathology*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D012189:Retrospective Studies