Abstract
Persistent left superior vena cava (PLSVC) is a rare and asymptomatic congenital cardiovascular anomaly. Being asymptomatic, PLSVC was usually discovered while performing interventions (such as insertion of central lines, Swan-Ganz catheters, or placing pacemakers) through the left internal jugular vein or left subclavian veins. Commonly, PLSVC is detected not only as an isolated congenital anomaly, but also it can be associated with many other cardiac anomalies. Also, presence of a dilated coronary sinus on echocardiography should raise the suspicion of PLSVC. The diagnosis should be confirmed by contrast venography or computed tomography angiography. The present case is a female patient, 29 year old, who was undergoing elective excision of a right atrial mass, with closure of patent foramen ovale, and she had end-stage renal failure on regular hemodialysis three times weekly through a permicath inserted in the right subclavian vein.