Abstract
A 26-year-old male with Marfan's syndrome complicated by renovascular hypertension was reported. Stenosis of the main renal artery among the left multiple renal arteries was proved. In the present case, a high incidence in cerebrovascular disturbance was found on the paternal side. The patient expired on account of malignant nephrosclerosis following an attack of cerebral apoplexy. The causative relationship between Marfan's syndrome and reno-vascular hypertension was discussed.