A 35-year-old female patient was referred to our hospital for coronary computed tomography angiography because of stable chest pain. Her electrocardiogram showed no abnormalities. Since 2009, the patient was known with a dilated left ventricle with a mildly reduced ejection fraction (45%). During follow-up, cardiovascular magnetic resonance imaging was performed, which showed no evidence of late gadolinium enhancement. No clear cause was found for the left ventricular dysfunction.