Nonossifying fibroma

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Fibroxanthoma; Fibrous cortical defect

Overview

• Non ossifying fibroma is a benign fibroblastic mass. It typically arises in the metaphyses of long bones, particularly the distal femur and tibia. It is common, possibly affecting more than 40% of boys and 30% of girls.It is thought to originate at the insertion site of a ligament or tendon and it has been suggested that it may reflect a previous traction injury. Lesions are usually asymptomatic, although they are occasionally associated with pathological fractures.

Diagnosis

Chest X-ray

• Eccentric lucent lesion with thinned cortex, which may have a multilocular appearance and often a sclerotic margin.
• The lesions spontaneously regress with time and radiographs will show increasing marginal sclerosis followed by progressive ossification of the lesion extending from its diaphyseal aspect.
• The appearance on plain films is characteristic and no further imaging is indicated.

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Atypical Fibroxanthoma

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  Atypical Fibroxanthoma
  Used with permission of Dermatology Atlas'
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  Atypical Fibroxanthoma
  Used with permission of Dermatology Atlas'