Dysplasia epiphysealis hemimelica of the proximal tibia showing epiphysealosteochondroma in an adult

A 33-year-old woman was referred to our hospital complaining of pain and a tumorous lesion in her left knee joint in the absence of any history of tra uma. Radiological examinations demonstrated an osseous mass originating fro m the epiphysis of the proximal tibia, with a continuous osteoblastic lesio n involving the lateral half of the epiphysis. The pathological diagnosis o f these lesions was compatible with that of osteochondroma. The clinical an d pathological features of this case were considered to be identical with t hose of dysplasia epiphysealis hemimelica, although this patient was older than patients described in previous reports, and demonstrated no other symp toms such as valgus or varus deformity or limb-length discrepancy. (C) Else vier Science Inc., 1999.