Conduction System Hamartoma: Autopsy Case Series

Area of Science:

• Cardiovascular Pathology
• Pediatric Pathology

Background:

• Conduction system hamartoma is a rare, benign lesion originating from cardiac conduction tissue.
• Previously termed histiocytoid cardiomyopathy, it is now classified by the WHO as conduction system hamartoma.
• This entity can lead to fatal arrhythmias and sudden cardiac death, particularly in young children.

Purpose of the Study:

• To investigate cases of conduction system hamartoma detected during postmortem histopathological examinations.
• To analyze the histopathological features, demographic data, and autopsy findings of these cases.
• To emphasize the importance of recognizing this condition for accurate diagnosis and management.

Main Methods:

• Retrospective review of histopathology reports from autopsies conducted between 2012 and 2022.
• Evaluation of four cases with conduction system hamartoma.
• Analysis included histopathological characteristics, demographics, autopsy findings, causes of death, and cardiac anomalies.

Main Results:

• Four cases of conduction system hamartoma were identified, with a female-to-male ratio of 3:1 and a mean age of 5.8 months.
• Microscopy showed sharply demarcated cell groups with foamy cytoplasm.
• Congenital heart disease and lung infection were the identified causes of death in all cases.

Conclusions:

• Conduction system hamartoma is an important entity to recognize in pediatric autopsies, especially in cases under two years of age.
• Awareness of this lesion is crucial for pathologists to prevent misdiagnosis and understand its role in sudden cardiac death.
• Extra cardiac sampling during autopsy may be necessary in suspected cases to confirm the diagnosis.