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We report an extremely rare association of left-sided inferior vena cava (IVC) in a 38-year-old female presenting with recurrent palpitation for the past 2 years with typical slow-fast atrioventricular reentrant tachycardia (AVNRT). We delineated the course of the left-sided IVC with pigtail injection and catheter course to the right atrium and successfully modified the slow pathway with conventional catheters with difficulty in ablation catheter maneuvering and his catheter stability was an issue. Our case is the first description of an unusual association of isolated left-sided IVC in a patient with typical AVNRT.