No abstract

Recently we have experienced a case of non-ossifying fibroma in the fibula. According to the Bone Tumor Resistry in Japan, the non-ossifying fibroma arises almost in lower femur and upper tibia, and it is rare that the non-ossifying fibroma occurs in fibula. Case; A girl of twelve complained pain in left knee after running. There was a history of trauma. Radiographs revealed a cystic lesion in the left upper fibula. At the time of examination, there was no redness and no venous dilatation, but there was tenderness on pressure over the affected area. At surgery the lesion was located in the marrow. The lesional tissue had a soft consistency. The color of the lesional tissue was gray. Micro-examination of the tissue demonstrated fibrous connective-tissue cells in a whorled pattern. There were small giant cells sporadically.