Two years ago at the meeting of the Central Surgical Association in Montreal we reported1 on a series of cases of renal artery stenosis with associated arterial hypertension. This work has been continued, and this paper is designed to assess the results obtained in our total series of 11 cases treated surgically and to discuss the progress made in diagnosis and surgical management. That arterial hypertension can result from insufficient blood supply to one or both kidneys has been proved beyond question. This presentation will omit any discussion of the mechanism of the "Goldblatt" kidney which has been so well covered by others.2,3 There is no doubt that a severe arterial hypertension associated with renal artery stenosis, especially in the lower age group, can be reduced to normal by adequate revascularization of the kidney. That this normotensive state can be maintained up to 3 years has been well