Table 1.

The histologic Milgram staging system of intraosseous lipomas compared to the radiologic findings.

Milgram stage	Histology	Radiology
1	Viable fat cells and ± bony trabeculae	Radiolucent, well defined, expands cortex
2	Viable fat + some fat necrosis + few dystrophic calcifications	Radiolucent, well defined and central calcifications
3	Viable fat + dystrophic calcifications + cyst formation + reactive bone formation	More radiodense with thick sclerotic borders