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Updated: May 31, 2026

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
Published on: April 7, 2015
Streptococcus pneumoniae causing mycotic aneurysm in a pediatric patient with coarctation of the aorta
Brian Haas1, Heath G Wilt, Karina M Carlson
1Department of Medicine and Pediatrics, University of Missouri Kansas City, MO 64108, USA. haasb@umkc.edu
Abstract:
Mycotic aneurysms are rare in patients with congenital heart disease, but may occur in those with aortic coarctation and abnormal aortic valve. Rapid diagnosis of mycotic aneurysm is of extreme importance given the significant reported incidence of morbidity and mortality across all age groups. Aortic aneurysm is uncommon before the second decade of life, and here we report a 10-year-old male patient with new diagnosis of aortic coarctation and bicuspid aortic valve, who developed a rapidly enlarging mycotic aneurysm from Streptococcus pneumoniae. Cardiac magnetic resonance imaging was crucial in making the diagnosis, as well as in follow-up.
Insights
Rapid diagnosis of mycotic aneurysms is critical in pediatric patients with congenital heart disease. A 10-year-old with aortic coarctation developed a Streptococcus pneumoniae mycotic aneurysm, highlighting the need for prompt imaging.
Area of Science:
- Cardiology
- Infectious Diseases
- Radiology
Background:
- Mycotic aneurysms are uncommon in pediatric patients, especially those with congenital heart disease.
- Congenital heart conditions like aortic coarctation and bicuspid aortic valve increase risk.
- Prompt diagnosis is crucial due to high morbidity and mortality rates.
Observation:
- A 10-year-old male with newly diagnosed aortic coarctation and bicuspid aortic valve presented with a rapidly enlarging mycotic aneurysm.
- The causative agent was identified as Streptococcus pneumoniae.
- Cardiac magnetic resonance imaging (CMR) was instrumental in diagnosis and monitoring.
Findings:
- This case highlights a rare presentation of a rapidly growing mycotic aneurysm in a pediatric patient with specific congenital heart defects.
- Streptococcus pneumoniae was identified as the pathogen.
- Cardiac MRI proved effective for diagnosis and follow-up.
Implications:
- Emphasizes the importance of considering mycotic aneurysms in pediatric patients with congenital heart disease presenting with concerning symptoms.
- Underscores the critical role of advanced imaging like cardiac MRI in early detection and management.
- Suggests potential need for heightened vigilance and tailored diagnostic approaches in this patient population.
Related Concept Videos
Aneurysm I: Introduction
Bacterial Meningitis I: Introduction
Aneurysm III: Interprofessional Care
Pneumonia I: Introduction
Atypical Pneumonia
Aneurysm II: Clinical Manifestations and Diagnostic Studies

