A Persistent Left-Sided Superior Vena Cava Detected on a O-15-H 2 O PET/CT of the Heart.

A persistent left-sided superior vena cava (PLSVC) is an uncommon finding with a prevalence of up to 0.5% in the general population. The PLSVC appears when the left anterior cardinal vein fails to regress as the ligament of Marshall during embryologic development. It is usually asymptomatic and discovered incidentally; however, its recognition is important because it might complicate invasive cardiovascular procedures. In this case, we report an incidental finding of a PLSVC detected on the O-15-H 2 O PET/CT of a patient who was referred for myocardial perfusion imaging.