title: Progressive frontal gait disturbance with atypical Alzheimer's disease and corticobasal degeneration.
abstract: OBJECTIVE
  The clinical neuropsychological, neuroradiological, and neuropathological description of two patients presenting with a frontal gait disturbance.
  
  
  METHODS
  Clinical case note review, neuropsychological assessment, functional imaging with (15)O(2) and (18)F-fluorodopa PET, and neuropathology.
  
  
  RESULTS
  Both patients presented with frontal gait impairment and only later developed more widespread cognitive impairment. In both cases (15)O(2) PET disclosed focal hypometabolism in the medial frontal lobes and in one patient (18)F-fluorodopa uptake into the caudate and putamen was normal. The neuropathological examination in one patient showed Alzheimer's histopathology together with large swollen eosinophilic neurons characteristic of corticobasal degeneration, which were particularly prominent in the medial frontal lobes.
  
  
  CONCLUSIONS
  Focal degeneration of the medial frontal lobes may present as an isolated gait disturbance and should be considered in the differential diagnosis of patients who present without an obvious structural abnormality on neuroimaging.
authors.affiliation: The National Hospital for Neurology and Neurosurgery, Queen Square, London, UK.
authors.forename: M N
authors.initials: MN
authors.lastname: Rossor
authors.forename: P J
authors.initials: PJ
authors.lastname: Tyrrell
authors.forename: E K
authors.initials: EK
authors.lastname: Warrington
authors.forename: P D
authors.initials: PD
authors.lastname: Thompson
authors.forename: C D
authors.initials: CD
authors.lastname: Marsden
authors.forename: P
authors.initials: P
authors.lastname: Lantos
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000000981:diagnostic imaging*; D001480:Basal Ganglia Diseases / Q000000981:diagnostic imaging*; D005260:Female; D005625:Frontal Lobe / Q000000981:diagnostic imaging* / Q000473:pathology; D005684:Gait / Q000502:physiology*; D006801:Humans; D014055:Tomography, Emission-Computed