Epiermoid cyst in the kidney.

Epidermoid cyst of the kidney is a rare entity. In the case here presented, epidermoid cyst was an incidental finding at urography performed in a 67-year-old man in connexion with splenectomy for polycythaemia. The cyst was interpreted as an old tuberculous focus. Two years later partial nephrectomy was performed because of repeated attacks of renal colic and signs of recurrent pyelonephritis. The diagnosis of epidermoid cyst was not made preoperatively in this case, or in the cases described in the literature.