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Updated: May 6, 2026
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Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
Published on: April 7, 2015
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Pulmonary artery pseudoaneurysm caused by Streptococcus constellatus
Yoshitomo Morinaga1, Katsunori Yanagihara, Hiroshi Gyotoku
1Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8501, Japan.
Summary
A rare case of mycotic pulmonary artery pseudoaneurysm (PAP) caused by Streptococcus constellatus infection was identified. Prompt recognition of this uncommon condition is crucial to prevent potentially fatal hemoptysis.
Area of Science:
- Medicine
- Infectious Diseases
- Cardiology
Background:
- Mycotic pulmonary artery pseudoaneurysm (PAP) is a rare but life-threatening complication of infections.
- Lung abscesses can serve as a nidus for the development of such vascular abnormalities.
Observation:
- A case of PAP was observed secondary to a lung abscess.
- The causative agent was identified as Streptococcus constellatus through microbiological analysis.
Findings:
- Pathological examination confirmed the presence of a pseudoaneurysm in the pulmonary artery.
- Bacterial presence within the pseudoaneurysm was definitively established.
- Microbiological analysis identified Streptococcus constellatus as the infecting organism.
Implications:
- This case highlights the importance of considering PAP in patients with lung abscesses and relevant symptoms.
- Early diagnosis and appropriate management of mycotic PAP are critical to prevent severe complications like hemoptysis.
- Understanding the infectious etiology, such as Streptococcus constellatus, aids in targeted treatment strategies.
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