In the course of our examination of candidates for induction into the United States Army an example of a rather rare clinical syndrome was encountered. While this disease has been described in the literature under a variety of names, the one suggested by Lichtenstein (1)—polyostotic fibrous dysplasia—appears satisfactory and has been adopted in describing the present case. McCune and Bruch (2) and Albright (3) and associates have reviewed the literature on this subject through 1937 summarizing some 21 cases. In 1942 Lichtenstein and Jaffe (4) added 15 new cases, which with 75 previously reported brought the total to that date to 90. The characteristic features of the syndrome are: (1) predominantly unilateral skeletal changes; (2) pigmented areas, in most cases roughly corresponding to the region of bony involvement; (3) sexual precocity in females. Moreover, the disease is more likely to occur in women than in men. Of unknown cause, the disease usually has its inception early in childhood, which suggests...