Nonossifying fibroma is a benign intracortical, multilocular and well-circumscribed lesion that affects young patients. It originates from the proliferation of fibrous tissue and histocytes. The most common locations are the distal femoral and distal tibial metaphyses. The lesion may move into the diaphysis with bone growth. At skeletal maturity, most NOF begin to heal on their own. Nonossifying fibroma is usually asymptomatic. When non-ossifying fibromas are less than 2 cm they are referred to as fibrous cortical defects. NOFs can also pose an increased risk of pathological fractures.

Radiographer: TSRM Fabio Imola