Introduction
The duplication of the inferior vena cava (IVC) is a rare anatomical variation occurs during embryological development of the IVC[1]. This anomaly interrupts the IVC, which renders the ablation of atrial fibrillation (AF) impossible with the standard approach via IVC to left atrium. To address the technical difficulty, we adopted the surgical bipolar radiofrequency ablation (endoscopic maze procedure) through the left chest cavity in patients with an interrupted IVC.