The Incidental Finding of a Persistent Left Superior Vena Cava: Implications for Primary Care Providers—Case and Review

Figure 4

(a) Schematic diagram demonstrating normal venous return to the right atrium. The vein of Marshall regresses during embryologic development, forming the ligament of Marshall. (b) Schematic diagram demonstrating a persistent left superior vena cava which empties into a dilated coronary sinus. The PLSVC results from failure of the vein of Marshall to regress during embryologic development.

(a)

(b)