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Updated: Apr 15, 2026

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Brainstem morphological changes in Alzheimer's disease.

Ji Han Lee1, John Ryan, Carmen Andreescu

  • 1aWashington University, St Louis, Missouri bDepartment of Psychiatry, School of Medicine, The University of Pittsburgh, Pittsburgh, Pennsylvania, USA cDepartment of Psychiatry, The Saint Vincent Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.

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Summary
This summary is machine-generated.

Alzheimer's disease (AD) patients show reduced brainstem volume and midbrain shape changes. This study is the first in-vivo imaging to reveal these structural brainstem alterations in AD.

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Gerontology

Background:

  • Brainstem nuclei are vital for autonomic, cognitive, and behavioral functions.
  • Brainstem dysfunction is implicated in Alzheimer's disease (AD) symptoms.
  • Previous studies on brainstem alterations in AD were postmortem.

Purpose of the Study:

  • To investigate in-vivo structural differences in brainstem volume and shape between AD patients and controls.
  • To identify the brainstem's role in AD progression.

Main Methods:

  • Structural neuroimaging (MRI) was used to compare brainstem volumes and deformations.
  • Fifty AD patients and 50 healthy elderly controls were recruited.
  • Statistical analyses included volume and shape comparisons with false discovery rate correction.

Main Results:

  • AD patients exhibited significant reductions in total brainstem volume compared to controls.
  • Significant brainstem deformations, particularly in the midbrain, were observed in AD patients.
  • This is the first in-vivo study to demonstrate structural brainstem changes in AD.

Conclusions:

  • Structural changes in the brainstem, especially the midbrain, may underlie AD-related cognitive and behavioral symptoms.
  • Brainstem dysfunction could be a core component of Alzheimer's disease neurobiology.
  • Further longitudinal studies are recommended to confirm these findings.