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A case of right ventricular aneurysm due to coronary artery disease in a 69-year-old male with no prior history of surgery or chest trauma is reported. The presence of the aneurysm was diagnosed by gated radionuclide angiography and confirmed by contrast angiography. This is the first description of an isolated right ventricular aneurysm on the basis of ischemic disease. In addition, the patient had recurrent ventricular tachycardia and frequent premature ventricular contractions (PVC's). Using radionuclide angiographic phase analysis of the PVC's, their apparent origin was localized to the margin of the right ventricular aneurysm.