title: Clinical correlates of white matter tract degeneration in progressive supranuclear palsy.
abstract: OBJECTIVE
  To use diffusion tensor imaging to assess white matter tract degeneration in progressive supranuclear palsy (PSP) and to investigate correlates between tract integrity and clinical measures.
  
  
  METHODS
  Case-control study.
  
  
  METHODS
  Tertiary care medical center.
  
  
  METHODS
  Twenty patients with probable PSP and 20 age- and sex-matched healthy controls were enrolled. All patients with PSP underwent standardized clinical testing, including the Frontal Behavioral Inventory and Frontal Assessment Battery to assess behavioral change, the PSP Rating Scale to measure disease severity, the Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale (parts II and III) to measure motor function, and the PSP Saccadic Impairment Scale to measure eye movement abnormalities.
  
  
  METHODS
  Fractional anisotropy and mean diffusivity were measured using region of interest analysis and tract-based spatial statistics.
  
  
  RESULTS
  Compared with controls, abnormal diffusivity was observed predominantly in the superior cerebellar peduncles, body of the corpus callosum, inferior longitudinal fasciculus, and superior longitudinal fasciculus in patients with PSP. Fractional anisotropy values in the superior cerebellar peduncles correlated with disease severity (r = -0.59, P = .006), inferior longitudinal fasciculus correlated with motor function (r = -0.51, P = .02), and superior longitudinal fasciculus correlated with severity of saccadic impairments (r = -0.45, P = .047).
  
  
  CONCLUSIONS
  The results of this study demonstrate that PSP is associated with degeneration of the brainstem, association, and commissural fibers and that this degeneration likely plays an important role in clinical dysfunction.
authors.affiliation: Department of Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA.
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Whitwell
authors.forename: Ankit V
authors.initials: AV
authors.lastname: Master
authors.forename: Ramesh
authors.initials: R
authors.lastname: Avula
authors.forename: Kejal
authors.initials: K
authors.lastname: Kantarci
authors.forename: Scott D
authors.initials: SD
authors.lastname: Eggers
authors.forename: Heidi A
authors.initials: HA
authors.lastname: Edmonson
authors.forename: Clifford R
authors.initials: CR
authors.lastname: Jack
authors.forename: Keith A
authors.initials: KA
authors.lastname: Josephs
mesh_terms: D000368:Aged; D001921:Brain / Q000473:pathology / Q000503:physiopathology; D016022:Case-Control Studies; D056324:Diffusion Tensor Imaging / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009413:Nerve Fibers, Myelinated / Q000473:pathology*; D009434:Neural Pathways / Q000473:pathology / Q000503:physiopathology; D011446:Prospective Studies; D013494:Supranuclear Palsy, Progressive / Q000175:diagnosis* / Q000473:pathology* / Q000503:physiopathology; D014855:Wallerian Degeneration / Q000175:diagnosis / Q000473:pathology / Q000503:physiopathology