[Dysplasia epiphysealis hemimelica (Trevor's disease)].

Dysplasia epiphysealis hemimelica is a rare skeletal developmental disorder characterized by asymmetric overgrowth of cartilage in the epiphyses. Due to the unusual and variable clinical picture, there is no standardized treatment and evolution is variable. We report the case of an 8 year-old boy, who was referred for the gradual appearance of a mass in the anterior region of the right knee. Plain films matched with dysplasia epiphysealis hemimelica. The histological findings confirmed the diagnosis. Treatment of dysplasia epiphysealis hemimelica is not clearly defined in the literature. However, only surgically symptomatic lesions or those that interfere with the function should be treated. Prognosis is variable and depends on the location and size of the lesion. Due to the risk of recurrence, patients with this unusual dysplasia should be monitored on a regular basis.