Several anatomic anomalies have been associated with the Wolff-Parkinson-White syndrome. However, its association with cor triatriatum has never been previously established. We present a case report on a 34-year-old woman patient with paroxysmic palpitations and data of ventricular preexcitation seen on electrocardiogram. The presence of non-obstructive cor triatriatum was observed during echocardiographic valoration prior to radiofrequency catheter ablation.