Giant diverticulum of coronary sinus with multiple accessory pathways treated with catheter ablation.

Coronary sinus abnormalities are usually associated with arrhythmia disorders when symptomatic. We report a 5-year-old 14 kg patient with a giant diverticulum of coronary sinus and Wolff-Parkinson-White syndrome. Catheter ablation therapy was decided during follow-up due to inadequate response to multidrug therapy. Posteroseptal and left posterolateral accessory pathways were established and radiofrequency ablation was performed successfully through coronary sinus.