[Familial periodic paralysis with hypokaliemia, hyperaldosteronism and extracellular vacuolization (author's transl)].

The observation of a 20 years old patient with a periodic paralysis is reported. During a crisis induced by 20 U of insulin and 150 g of glucose, transient hyperaldosteronism was found and the muscular biopsy performed in the left biceps brachii, disclosed vacuoles with a double membrane. The significance of these findings is discussed.