Sandbox: Bone DDx
- 20 yo patients
- Painless, slowly growing mass
- Lytic bone lesions with geographic pattern of bone destruction on X ray
- Located at metaphysis of long bones
- Narrow zone of transition
- Non-sclerotic margins
- Internal pseudotrabeculation
- Mature, bland fibroblasts
- Little cellularity, no pleomorphism
- Abundant collagenous stroma
- Thin walled, dilated vascular channels