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Porphyromonas gingivalis as a Model Organism for Assessing Interaction of Anaerobic Bacteria with Host Cells
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Published on: December 17, 2015

An unusual autopsy case of pyogenic liver abscess caused by periodontal bacteria

Hideki Ohyama1, Keiji Nakasho, Koji Yamanegi

  • 1Department of Pathology, Hyogo College of Medicine, Hyogo 663-8501, Japan. ohyama@hyo-med.ac.jp

Japanese Journal of Infectious Diseases
|September 19, 2009
PubMed

Insights

This study identifies periodontal infection as a potential source of pyogenic liver abscess (PLA). Researchers found specific periodontopathic bacteria in a cryptogenic PLA case, linking severe periodontitis to liver abscess formation.

Area of Science:

  • Microbiology
  • Pathology
  • Infectious Diseases

Background:

  • Pyogenic liver abscess (PLA) is a serious condition often originating from biliary, portal venous, or hepatic arterial infections.
  • Approximately 50% of PLA cases remain cryptogenic, lacking an identifiable source or route of infection.
  • Understanding cryptogenic PLA is crucial for improving diagnosis and treatment strategies.

Observation:

  • An autopsy case of a 59-year-old female with sudden cardiopulmonary arrest revealed a pyogenic liver abscess.
  • Initial examinations failed to identify the infectious source or route, classifying the PLA as cryptogenic.
  • The patient had a history of severe, long-standing periodontitis.

Findings:

  • Immunohistochemical analysis of the PLA identified several key periodontopathic bacterial species.
  • Identified bacteria included *Fusobacterium nucleatum*, *Treponema denticola*, *Prevotella intermedia*, and *Porphyromonas gingivalis*.
  • This provides direct evidence linking periodontal infection to PLA formation.

Implications:

  • Periodontal disease should be considered a potential, previously underestimated, source of infection for cryptogenic PLA.
  • This finding may necessitate a re-evaluation of diagnostic approaches for unexplained liver abscesses.
  • Targeting periodontal health could be a novel strategy for preventing certain types of PLA.

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