Although the syndrome of primary aldosteronism is now a recognized entity, the occurrence of diabetes in this disease has not been emphasized until recently.^1,2 The clinical picture of periodic muscular weakness, intermittent tetany and paresthesias, polyuria, polydipsia, and hypertension, along with the findings of hypokalemia, hypernatremia, and alkalosis and the demonstration of an aldosterone-secreting tumor of the adrenal, was first described by Conn,³ in 1955. Since then at least 30 cases have been recognized.⁴ Many have been reported in retrospect from autopsy material. McCullagh ¹ and Hewlett et al.² have recently reported three cases of primary aldosteronism in which a diabetic tendency was a prominent feature. It was felt that the diabetes arises as a result of excess aldosterone secretion and is of a very mild variety.¹ It is the purpose of this report to document a case having the clinical and laboratory findings compatible