Cardiac catheterization is not only a diagnostic tool but also a means of treatment of coronary artery disease. Coronary artery dissection is one of the complications of cardiac catheterization. Emergency coronary artery bypass graft (CABG) surgery is indicated when coronary artery dissection is associated with unstable perfusion or residual severe stenosis. We present a case of progressive type-A aortic dissection as a continuity of catheterization-induced dissection of right coronary artery (RCA) with occlusion, disclosed by transesophageal echocardiography (TEE) during the emergent CABG surgery for the iatrogenic injury. Once the aortic dissection has been diagnosed by TEE, the surgical procedure and cannulation site for cardiopulmonary bypass were altered from those used in regular CABG surgery. Therefore, TEE is able and valuable in such situation to detect this rare but severe complication due to catheterization, especially when retrograde coronary artery dissection has been noted preoperatively.