Since 1950, when cortisone was first used for the treatment of virilizing adrenal hyperplasia, the methods and results of therapy have been reported from time to time from this clinic 1-9 and by other workers,10-13 and the differential diagnosis also has been discussed.8,9 This paper summarizes briefly the present concepts concerning the pathogenesis and differential diagnosis of this disorder, and the results of treatment with cortisone and some of the newer closely related steroids. 7 10 il 17 ¡ 6 fi