Both Trevor and Ollier disease limited to one upper extremity.

A case is presented of a young boy in whom features of Trevor's dysplasia epiphysealis hemimelica and Ollier's enchondromatosis coexisted in a single extremity, the right upper. As Trevor disease consists of osteochondromas of epiphyses and their equivalents, such as carpal and tarsal bones, it is of interest that exostosis-like centers of the neck of radius and perhaps the proximal third metacarpal are present as well. Advanced maturation of selected centers was most marked at the right scaphoid. The child shows alignment abnormalities as a consequence of the varied lesions, including a varus of the right wrist. The coexistence of these varied osteochondromatous abnormalities in one extremity suggests a relationship in their etiologies.