Commonly known as bone island
Mature cortical bone within the medulla
Due to failure of resorption during endochondral ossification
Asymptomatic
Features:
CT/Radiograph:
- Spiculated margin - blends with the surrounding trabecular bone
- Dense sclerotic focus
MR:
- All sequences: Very low SI
Scintigraphy
- Typically no activity. Some may have increased activity
DDx:
- Dense osteoid osteoma
- Osteoblastoma
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