Periosteal chondroma is an uncommon benign tumor, arising from the periosteal or parosteal tissue. A case of periosteal chondroma is presented in this paper. The patient was fifteen-year-old boy and was reffered to our clinic with chief complaint of tumor formation and pain in the middle part of his left upper arm. Radiological examination revealed a cortical indentation with juxtacortical soft--tissue mass, that was overlying on the shallow cortical indentation. En-block excision of the tumor

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... as performed with bone grafting into the bone defect. Recurrence was suspected at the time of radiological check about nine months after surgery.