[Periosteal desmoid].

A case of periosteal desmoid is studied. Being of a rather often incidence in children it might be confused with others lesions located on distal femoral metaphysis and which sometimes form part of pathology typical of the developing skeleton as cortical defects and non osteogenic fibromas and the others which might be a question of malignant process. Periosteal desmoid is characterized by appearing as a radiolucent lesion with periosteal speculation of the dorsomedial cortical wall of the medial femoral condyle, on adductor insertion zone. Simple radiology study in these lesions must be emphasized, without necessity to use more cruel techniques.