Fifteen new cases of dysplasia epiphysealis hemimelica are reported and the literature is reviewed. The cartilage overgrowth was usually found to be limited to one extremity and to half of the affected epiphysis.
The microscopic pathological changes are indistinguishable from those of an osteocartilaginous exostosis.
Excision of the lesion is indicated when it produces deformity or interferes with function. Other procedures are seldom required.
These lesions retain the potential for cartilage proliferation in adult life and, we presume, for malignant degeneration. They should be closely followed in the adult and be removed if they increase in size.