Musculoskeletal ImagingNonossifying fibroma
a
benign tumour arising from fibrous connective tissue, which is composed of whorled bundles of connective tissue cells. This
tumour has a propensity to develop at sites of muscular attachment to bones and may be related to
fibrous cortical defect and the names are sometimes used interchangeably. However, some differerences do exist; nonossifying fibromas tend to be larger and more often symptomatic. These lesions may develop as a result of unrecognized local
trauma that has caused
focal haemorrhage and oedema.
The most common sites of involvement are the long tubular bones, especially the tibia and femur. Usually they involve the posterior wall and medial rather than lateral bone surface. On radiographs focal, shallow radiolucent areas are observed in the cortex with normal or sclerotic bone adjacent to the lesion. Sometimes a blister-like peripheral shell of bone is present. With growth of the bone, an apparent shaftward migration from the metaphysis may occur; segmental sclerosis may be seen in part of the bone defect.
Among the complications occurring in persons with nonossifying fibroma are pathologic fracture, osteomalacia and rickets, and Jaffe Campanacci syndrome.
DR