A rare case of renovascular hypertension due to iatrogenic thoracoabdominal aortic dissection. A report of successful surgical treatment in childhood. Renovascular hypertension due to iatrogenic thoracoabdominal aortic dissection in an 8-year-old girl with aortic valvular stenosis is presented. A splenorenal arterial anastomosis without splenectomy was successfully performed. This procedure is considered best suited for children with thoracoabdominal aortic dissection as the autogenous graft is expected to grow and provide long-term patency. The spleen left in situ was expected to be advantageous, from the immunological aspect, at the time of open heart surgery for aortic valvular stenosis, which was anticipated in the near future in this child. 