Non-tumor
- Stress fracture
- Fracture callus
- Myositis ossificans
Benign
- Osteochondroma
- Periosteal chondroma
Malignant
- Parosteal osteosarcoma
- Periosteal osteosarcoma
- Parosteal chondrosarcoma
Notes
- Myositis ossificans is generally distinct from the cortex of the underlying bone. This may be best appreciated with cross-sectional imaging, such as CT.
- In osteochondromas, the cortex of the exostosis blends with the cortex of the underlying bone; the marrow cavity of the lesion is continuous with the underlying bone marrow.
- Parosteal osteosarcoma arises on the surface of the bone like a lump of plastacene.
- Periosteal chondroma seems to arise within the cortex, erodes into the cortex, and expands outward into the soft tissues.
- Periosteal osteosarcoma and chondrosarcoma generally have a soft tissue mass with matrix formation.
Other Differential Diagnoses by Anatomic Location
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