[Simple renal cysts in the adult. Anatomical study. Aetio-pathogenic considerations, based upon 57 cases (author's transl)].

On the basis of 57 cases of simple cysts of the kidney in adults, the authors describe the histological nature of their wall. They stress the extremely common presence of smooth muscle fibres, drawing no inference that they might be of calyceal origin. The congenital or acquired nature of these cysts, as well as their origin is discussed.