Fibrous cortical defect
is usually an incidental finding, affecting 30% to 40% of the pediatric population, (49) with a relatively high rate of bilaterality and multiplicity.
The histogenesis and classification of fibrohistiocytic lesions involving bone and containing an admixture of fibrous tissue, foam cells, and giant cells are confusing and include several overlapping entities, such as metaphyseal fibrous defect, nonossifying fibroma, fibrous cortical defect
, fibroxanthoma, and benign fibrous histiocytoma (BFH) of bone.
Metaphysical fibrous defects, also called fibrous cortical defects
(FCD), are the asymptomatic, nonneoplastic and self-healing tumors of bone, which occur commonly in the metaphysis of long bone, especially in the lower extremities.