A 7-year-old girl with tetralogy of Fallot in association with a single right coronary artery, was successfully re-operated on for right ventricular outflow tract obstruction. To identify the course of the abnormal coronary arteries during the re-operation, a probe was directly inserted into the coronary arteries after aortotomy. Ventriculotomy was successfully performed under the guide of the probe, without damaging the coronary arteries. Double outflow technique was applied for the relief of the right ventricular outflow tract obstruction.
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