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Brain biopsy in dementia.

J D Warren1, J M Schott, N C Fox

  • 1Dementia Research Centre, Institute of Neurology, London, UK. jwarren@dementia.ion.ucl.ac.uk

Brain : a Journal of Neurology
|May 20, 2005
PubMed
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Brain biopsy aids dementia diagnosis, identifying conditions like Alzheimer's and Creutzfeldt-Jakob disease. While complications exist, it can guide treatment for treatable inflammatory disorders.

Area of Science:

  • Neurology
  • Neurosurgery
  • Pathology

Background:

  • The diagnostic utility of brain biopsy in dementia remains debated.
  • Cerebral biopsies are invasive procedures with potential risks.

Purpose of the Study:

  • To retrospectively analyze the diagnostic yield and complication rates of brain biopsies in dementia investigation.
  • To identify predictors for diagnostic success and treatable conditions.

Main Methods:

  • Retrospective analysis of 90 consecutive cerebral biopsies for dementia investigation (1989-2003).
  • Biopsies involved full-thickness resection of frontal cortex, white matter, and leptomeninges.
  • Analysis of diagnostic outcomes, complications, and correlation with clinical/laboratory findings.

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Main Results:

  • 57% of biopsies were diagnostic, with common findings including Alzheimer's disease (18%), Creutzfeldt-Jakob disease (12%), and inflammatory disorders (9%).
  • Non-specific gliosis was the most frequent finding (37%) in non-diagnostic cases.
  • Complications occurred in 11% (seizures, infections, hemorrhage), with no deaths or lasting sequelae. Biopsy information influenced treatment in 11% of cases.

Conclusions:

  • Cerebral biopsy is valuable in dementia diagnosis, particularly when treatable inflammatory conditions are suspected.
  • Elevated cerebrospinal fluid (CSF) cell count predicts treatable inflammatory processes.
  • Specific clinical and laboratory features may help select patients for biopsy when other methods are inconclusive.