Transcatheter resolution of a post-surgical "Iatrogenic" circular shunt in a child.

Circular shunt is a very rare, albeit critical, condition. We present a case of a post-surgical circular shunt that resulted after correction of an anomalous total pulmonary venous connection to the coronary sinus with a persistent left superior vena cava. A left cavo-pulmonary anastomosis was performed; however, she developed heart failure during follow-up. The anastomosis was closed by interventional cardiac catheterisation without complications that led to resolution of heart failure symptoms.