[Resection of a right ventricular diverticulum of fibrous type by off-pump cardiac surgery; report of a case].

Right ventricular diverticulum is very rare and we experienced a case of isolated right ventricular diverticulum in an adult patient The patient was an 80-year-old man and a 3-cm-diameter round mass at the apex of the heart was pointed out by screening computed tomography (CT). A small and akinetic diverticulum having a narrow communication with the right ventricle was revealed by right ventriculography. Upon surgery, a 3-cm-diameter diverticulum was found at the acute margin of the right ventricle. The diverticulum was exposed using the off-pump coronary artery bypass grafting (CABG) technique. Two mattress sutures of 4-0 Prolene with Teflon felt strips were used to close the communication between the diverticulum and the right ventricle, then, the diverticulum was resected. His postoperative course was uneventful. Pathological examination revealed the endothelial-lined wall of the diverticulum consisting of internal elastic lamina and discontinuous thin smooth muscle layer with no myocardium. This type of right ventricular diverticulum could be resected by the off-pump CABG technique.