Imaging correlates of posterior cortical atrophy

Neurobiol Aging. 2007 Jul;28(7):1051-61. doi: 10.1016/j.neurobiolaging.2006.05.026. Epub 2006 Jun 23.


The aim of this study was to compare patterns of cerebral atrophy on MRI, and neurochemistry on magnetic resonance spectroscopy (MRS), in patients with posterior cortical atrophy (PCA) and typical Alzheimer's disease (AD). Voxel-based morphometry was used to assess grey matter atrophy in 38 patients with PCA, 38 patients with typical AD, and 38 controls. Clinical data was assessed in all PCA patients. Single voxel (1)H MRS located in the posterior cingulate was analyzed in a subset of patients with PCA, typical AD, and control subjects. PCA showed a pattern of atrophy affecting occipital, parietal and posterior temporal lobes, compared to controls. The pattern was bilateral, but more severe on the right. Patients with PCA showed greater atrophy in the right visual association cortex than patients with typical AD, whereas those with AD showed greater atrophy in the left hippocampus than those with PCA. (1)H MRS suggested loss of neuronal integrity and glial activation in subjects with PCA and typical AD. The differing patterns of atrophy on MRI suggest that PCA should be considered a distinct entity from typical AD.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Alzheimer Disease / metabolism
  • Alzheimer Disease / pathology
  • Alzheimer Disease / physiopathology
  • Analysis of Variance
  • Atrophy / pathology
  • Atrophy / physiopathology
  • Brain Mapping
  • Cerebral Cortex / metabolism*
  • Cerebral Cortex / pathology*
  • Cerebral Cortex / physiopathology
  • Female
  • Functional Laterality
  • Humans
  • Magnetic Resonance Imaging*
  • Magnetic Resonance Spectroscopy*
  • Male
  • Middle Aged
  • Retrospective Studies