Left coronary artery-to-right atrium fistula: an evaluation of MSCT angiography before and after transcatheter closure with a PDA occluder.

The MSCT manifestations of a left coronary artery-to-right atrium fistula before and after the transcatheter closure were reported. Before treatment, MSCT showed a dilated left coronary sinus and the dilated left main trunk, which coursed along the coronary sulcus to form the left circumflex artery, draining directly into the right atrium in the left middle part. The fistula was occluded with a PDA occluder. Four days after the occlusion, MSCT showed that the fistula was completely occluded and there was massive thrombosis in the central part and around the occluder. The thrombus was found even in the segment near to the start point of the oblique marginal artery.