Neuropathology in controls and demented subjects from the Baltimore longitudinal study of aging

Juan C. Troncoso, Lee J. Martin, Gloria Dal Forno, Claudia H. Kawas

Research output: Contribution to journalArticlepeer-review


To establish correlations among cognitive states and neuropathology, we have examined 22 subjects (69-97 years of age) from the Baltimore Longitudinal Study of Aging (BLSA), of whom 15 had normal and stable cognitive performances and seven had dementia of variable severity. In the majority of normal subjects, few or no β-amyloid (Aβ) deposits or senile plaques (SP) were present in the neocortex, but neurofibrillary tangles (NFT) were consistently found in CA1 of hippocampus and layer II of entorhinal cortex. In two (15%) normal individuals, the densities of SP were consistent with the diagnosis of possible Alzheimer's disease (AD). We speculate that these cases with normal cognitive states and abundant neocortical SP may represent preclinical AD. We conclude that the neocortex of a majority of cognitively intact individuals can remain free of Aβ deposits or SP, even into the tenth decade of life.

Original languageEnglish (US)
Pages (from-to)365-371
Number of pages7
JournalNeurobiology of aging
Issue number3
StatePublished - 1996


  • Alzheimer's disease
  • aging
  • senile plaques
  • β-amyloid protein

ASJC Scopus subject areas

  • Neuroscience(all)
  • Aging
  • Clinical Neurology
  • Developmental Biology
  • Geriatrics and Gerontology


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