[A patient without intracardiac ECG. Persistent azygos vein].

Interruption of inferior vena cava with azygos continuation is a rare venous anomaly. We report the case of a 17 old male with Wolf-Parkinson-White syndrome and a persistent vena azygos. Despite the complex anatomical situation, it was possible to safely ablate a lateral accessory pathway with radiofrequency energy using a femoral retrograde approach.