In summary, the authors feel that this case, presented roentgenographically, demonstrates, See Images in the PDF file as in a slow-motion picture, the uninterrupted course of events in chondrodystrophia calcificans congenita. The sequence of events leading to fusion of the areas of stippling of the epiphyses is demonstrated. It appears that there is a definite variation in the degree of involvement in the different cases reported, and that those cases with marked involvement and with associated anomalies have a poorer prognosis. The authors feel that the manifestations constitute a definite chondrodysplasia with variation in potentiality in regard to the eventual effect on completion of development.