Echocardiographic progression of a subepicardial aneurysm after inferior myocardial infarction.

A 62-year-old man presented to hospital with chest oppression. Coronary angiography revealed total occlusion of the right coronary artery and inferior myocardial infarction was diagnosed. He was treated by percutaneous coronary intervention with stenting for myocardial infarction. After four months, echocardiography revealed a huge aneurysm protruding below the inferior surface of the left ventricle. It was considered to be a pseudoaneurysm from the echocardiographic findings. The patient had no symptoms and he refused surgery, so progression of the aneurysm was monitored carefully. At seven months after revascularization, the aneurysm showed a marked increase in size, with a maximal diameter of 48 mm and orifice diameter of 22 mm. Accordingly, the patient agreed to undergo surgical excision. The aneurysm was resected and the defect was closed with a pericardial patch. Pathological examination revealed all of the myocardial elements in the aneurysm wall and thrombus in its lumen. In conclusion, this was a rare case of ventricular subepicardial aneurysm.