Metaphyseal fibrous defect
| Template:Metaphyseal fibrous defect | |
|---|---|
| Diagnosis in short | |
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| 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 an radiographic incidentaloma
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 tumor of bone (epiphyseal location, occurs in adults)
Relevant Diagnostic Groups
- FOG MACHINES - acronym for radiographically lytic bone lesions Cite error: Invalid
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Clinical history
- Incidental radiographic finding
- Pathologic fracture
Radiographic findings
Sharply demarcated, lucent, loculated, meta-diaphyseal lesion surrounded by a rim of sclerotic bone
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BONE; CURETTAGE: METAPHYSEAL FIBROUS DEFECT.