Metaphyseal fibrous defect
| Template:Metaphyseal fibrous defect | |
|---|---|
| Diagnosis in short | |
|
| |
| Synonyms | Nonossifying fibroma |
| Clinical history | Incidental radiograhic finding |
| Radiology | Lucent defect |
General
- Common
- Non-neoplastic
- Self-limited
- Skeletally immature individuals, children and adolescent
- Often small lesions discovered as an radiographic incidentaloma
- Rarely seen as a pathologic specimen (should not be biopsied)
Synonyms
- Nonossifying fibroma (larger but otherwise identical)
- Fibrous cortical defect
- Fibrous metaphyseal defect
- Fibroxanthoma of bone
Site
- Metaphysis of distal femur or proximal tibia (80%)
- Cortical
- Metaphysis
- Long bones
- Eccentric location
Gross
Firm, granular, brown to yellow to red
Microscopic
Spindle cells without cytologic atypia are arranged in a storiform pattern with scattered chronic inflammatory cells and benign giant cells. Foam cells and hemosiderin deposition are present. Mitoses are seen but cytologic atypia is absent.
Differential Diagnosis
- Giant cell tumour of bone (epiphyseal location, occurs in adults)
Relevant Diagnostic Groups
Images
![[1]](http://njms2.umdnj.edu/tutorweb/casegifs/nofhe1.jpg){kind=link}
![[2]](http://njms2.umdnj.edu/tutorweb/casegifs/nofhe2.jpg){kind=link}
![[4]](http://pathologyoutlines.com/wick/non-ossifying%20fibroma%20(metaphyseal%20fibrous%20defect)%20micro.jpg){kind=link}
Stains
Not relevant.
IHC
Not relevant
Molecular
Not relevant
Syndromes
Jaffe-Campanacci syndrome [3]
Clinical history
- Incidental radiographic finding
- Pathologic fracture
Prognosis
- Ideally should not be biopsied
- Radiographically characteristic and benign
- Ideally should not be treated or even biopsied
- Spontaneously resolve by ossification
- May resolve into a 'bone island'
Radiographic findings
Sharply demarcated, lucent, loculated, meta-diaphyseal lesion surrounded by a rim of sclerotic bone
Sign out
BONE; CURETTAGE: METAPHYSEAL FIBROUS DEFECT / NONOSSIFYING FIBROMA.