Pathological fracture in non-ossifying fibroma with histological features simulating aneurysmal bone cyst

A 12-year-old-girl presented with a fracture of an osteolytic lesion of the distal radius. A 7-year-old girl presented with a fracture of an osteolyti c lesion of the femoral shaft. In both cases it was a nonossifying fibroma with fracture misdiagnosed at pathology as aneurysmal bone cyst. Fractures through non-ossifying fibromas may alter the histological pattern the initi al lesion in two ways: firstly, by the presence of brood pigments due to th e fracture, and secondly, by formation of new bone. Radiological-pathologic al correlation is essential to avoid histological errors after pathological fracture in a nonossifying fibroma.