title: Expanding the phenotypic associations of globular glial tau subtypes.
abstract: BACKGROUND
  Clinicopathologic correlation in non-Alzheimer's tauopathies is variable, despite refinement of pathologic diagnostic criteria. In the present study, the clinical and neuroimaging characteristics of globular glial tauopathy (GGT) were examined to determine whether subtyping according to consensus guidelines improves clinicopathologic correlation.
  
  
  METHODS
  Confirmed GGT cases (n = 11) were identified from 181 frontotemporal tauopathy cases. Clinical and neuroimaging details were collected, and cases sub-typed according to the consensus criteria for GGT diagnosis. Relationships between clinical syndrome and GGT subtype were investigated.
  
  
  RESULTS
  In total, 11 patients (seven males, four females, mean age = 67.3 +/- 10.6 years) with GGT were included. Most, but not all, presented with behavioral variant frontotemporal dementia, but none had amyotrophic lateral sclerosis. Subtyping of GGT proved to be difficult and did not improve clinicopathologic correlation.
  
  
  CONCLUSIONS
  Sub-classification of GGT pathology may be difficult and did not improve clinicopathologic correlation. Better biomarkers of tau pathology are needed.
authors.affiliation: Neuroscience Research Australia, Sydney, Australia; University of New South Wales, Sydney, Australia.
authors.forename: James R
authors.initials: JR
authors.lastname: Burrell
authors.affiliation: Discipline of Pathology, Sydney Medical School, The University of Sydney, Sydney, Australia.
authors.forename: Shelley
authors.initials: S
authors.lastname: Forrest
authors.affiliation: Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, United Kingdom.
authors.forename: Thomas H
authors.initials: TH
authors.lastname: Bak
authors.affiliation: Neuroscience Research Australia, Sydney, Australia; University of New South Wales, Sydney, Australia.
authors.forename: John R
authors.initials: JR
authors.lastname: Hodges
authors.affiliation: Neuroscience Research Australia, Sydney, Australia; University of New South Wales, Sydney, Australia.
authors.forename: Glenda M
authors.initials: GM
authors.lastname: Halliday
authors.affiliation: Discipline of Pathology, Sydney Medical School, The University of Sydney, Sydney, Australia.
authors.forename: Jillian J
authors.initials: JJ
authors.lastname: Kril
keywords: Clinicopathological correlation; Frontotemporal dementia; Globular glial tau; Tauopathy