Catheter ablation in a patient with a congenital giant right atrial diverticulum presented as Wolff-Parkinson-White syndrome

A young woman symptomatic for tachycardia showed right ventricular preexcit ation an the surface ECG with a pattern during induced atrial fibrillation suggestive of multiple APs. Noninvasive imaging techniques performed prior to catheter ablation demonstrated the presence of a giant right atrial dive rticulum confirmed bq hemodynamic procedure. This structure functioned as a n enormous accessory AP. We performed catheter ablation of this pathway usi ng a special 4-mm multipolar catheter inside the diverticulum. This is the first case of such an anomaly being successfully treated with catheter abla tion.