Permanent third-degree atrioventricular block as clinical presentation of an intracardiac bronchogenic cyst

Area of Science:

• Cardiology
• Thoracic Surgery
• Medical Imaging

Background:

• Bronchogenic cysts are congenital anomalies typically found in the mediastinum.
• Intracardiac locations for bronchogenic cysts are exceptionally rare.
• Atrioventricular block (AVB) can result from various cardiac and non-cardiac etiologies.

Observation:

• A rare case of an intracardiac bronchogenic cyst located near the atrioventricular node was identified.
• The cyst was associated with an ostium secundum atrial septal defect.
• The patient presented with permanent complete atrioventricular block.

Findings:

• The intracardiac bronchogenic cyst was the likely cause of the atrioventricular block.
• The co-occurrence of the cyst and atrial septal defect presented a unique clinical scenario.
• Surgical or interventional management of the cyst may be considered.

Implications:

• This case expands the differential diagnosis for intracardiac masses and atrioventricular block.
• Highlights the importance of considering rare congenital anomalies in the evaluation of cardiac conduction defects.
• Suggests potential for novel therapeutic approaches in managing complex congenital heart conditions.