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An asymptomatic 61 year old woman was referred to our institution because of diastolic murmur. She had no illness comparable to Kawasaki disease. An abnormal cavity in the interventricular septum with the jet flowing from the left anterior descending coronary artery into the cavity was detected by Doppler echocardiography. Coronary angiography showed a 25 × 15 mm aneurysm in the septal branch of the left anterior descending artery (panel A). Multislice computed tomography showed that the minimal distance between the left ventricular cavity and the aneurysmal cavity was only 1 mm (panel B). Considering that the pressure on both sides of the aneurysmal wall must be almost the same, we have not performed surgery or catheter intervention and have placed the patient under close observation.