Dissection of the descending aorta post coarctation repair in a patient with Turner's syndrome has rarely been described. A 45-year-old woman with Turner's syndrome had repair of coarctation by resection and interposition graft. Her postoperative course was uneventful. Chest X-ray two months postoperatively showed a hematoma in the proximal descending aorta, and a CT scan confirmed dissection distal to the coarctation repair, which was treated medically. Subsequent CT scanning one year later showed the hematoma resolving with no increase in the diameter of the dissected segment.