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Summary
A rare mesothelioma tumor completely replaced the atrioventricular (AV) node in a young child, causing heart block and sudden death. This highlights mesothelioma as a potential cause of fatal cardiac arrhythmias.
Area of Science:
- Cardiovascular Pathology
- Pediatric Oncology
- Cardiac Electrophysiology
Background:
- Sudden death in children necessitates thorough investigation into underlying cardiac and oncological causes.
- Atrioventricular (AV) block can manifest with various etiologies, impacting cardiac conduction.
- Mesothelioma, typically associated with serosal surfaces, is exceptionally rare within cardiac structures.
Observation:
- A 21-month-old boy presented with a heart murmur and second-degree AV block.
- The child experienced sudden death six months post-presentation.
- Autopsy revealed a diffuse mesothelioma encasing the AV node and extending into the central fibrous body.
Findings:
- The mesothelioma extensively infiltrated the AV node, disrupting normal cardiac electrical conduction.
- The bundle of His and bundle branches remained histologically uninvolved.
- This specific tumor location resulted in supra-His (AV) block, leading to fatal arrhythmias.
Implications:
- Mesothelioma of the AV node represents a rare but critical differential diagnosis for pediatric sudden cardiac death.
- Early recognition of cardiac symptoms in children with potential oncological predispositions is vital.
- This case underscores the importance of comprehensive autopsy in unexplained pediatric deaths, particularly those with cardiac manifestations.