Coronary sinus diverticulum complicating CRT device implantation.

Coronary sinus diverticula are rare findings usually associated with the presence of accessory pathways. We report the case of a 74-year-old man, who underwent cardiac resynchronization therapy (CRT) device implant. Coronary sinus diverticulum was an incidental finding while attempting to subselectively cannulate the coronary sinus for left ventricle lead implant. The case was able to be completed without complications.