Cardiogenic Shock Induced by Coronary Steal Syndrome Through a Neovessel of Mediastinal Neuroendocrine Tumor

A woman was admitted for cardiogenic shock with a left ventricular ejection fraction of 15%. Coronary angiography showed a neovessel coursing superiorly toward a mediastinal mass. Cardiac dysfunction was assumed to be the result of coronary steal, and the neovessel was embolized, thereby allowing recovery of the left ventricular ejection fraction. (Level of Difficulty: Advanced.).