fibrous cortical defect

Last reviewed 01/2018

This is the commonest benign lesion of bone.

It is caused by the failure of a nest of fibrous tissue to calcify.

Non-ossifying fibromas are usually diagnosed incidentally during childhood.

The commonest sites are the metaphyses of long bones.

Treatment is usually unnecessary because healing occurs spontaneously over a period of several years. If a pathological fracture occurs across an exceptionally large lesion then curettage and bone grafting is required.