That dermatofibrosarcoma protuberans is not of such rare occurrence as previously supposed is illustrated in Hertzler's1experience by the observation of 22 instances of it within twenty-five years. McMaster2reviewed the important literature on the subject in 1931 and tabulated 39 undoubted cases, including a case of his own. Ruiter,3in reporting 2 cases in 1936, made the statement: "Up to and including 1934, there had been reported 37 incontestable cases of dermatofibrosarcoma protuberans. A survey of the year 1935 showed over 50 cases reported, which must be explained by the more widespread knowledge of this tumor." He did not, however, furnish a complete bibliography. Favre and Josserand4noted that this neoplasm has been studied particularly in Italy (Scolari, Scomazzoni, Levi, Bertaccine, Casazza, Pinetti, and others). In France, also, a considerable number of cases have been reported (Chatellier, Boisson, Milian and Perrin, Margarot and Guibert, and