In this work an attempt has been made to find a general nosological formula of induratio penis plastica in order to compare the typical and numerous possibilities of therapy. The author has developed a classification based on the T.N.M. system, whereby the typical parameters of this disease, such as the grade of induration and deviation, as well as the subjective symptoms of pain and the ability of penetration has been considered in this system. The size of the indurations and the number of solidifications are as important as the site. This nomenclature makes it possible pro futuro to obtain a comparative therapeutic assessment in induratio penis plastica and, hence, to obtain guidelines on the indication for the optimal therapy of Peyronie's disease.