II. Epidemiology
- Most common under age 20 years old (70% of cases)
III. Pathophysiology
- Benign neoplasm arising in bone (esp. long bones)
- Lesion center contains Osteoblasts that produce both osteoid and to a lesser extent, bone
- Lesion surrounded by hypervascular sclerotic bone, that limits growth
IV. Symptoms
- Focal night pain
V. Signs
- Leg Length Discrepancy may occur (due to asymmetric growth)
- Focal findings may occur
- Localized swelling
- Muscle atrophy or contractures may form
VI. Imaging
- XRay
- Bone lucency with central, core density
- MRI
- Indicated in non-diagnostic XRay
VII. Management
- NSAIDs
- Lesion destruction (surgical excision or radiofrequency ablation)
- Indicated in severe pain or persistent course
- Lesions may recurr after excision
VIII. Course
- Lesions typically resolve spontaneously over months to years
IX. References
- Gardiner (2018) Crit Dec Emerg Med 37(5): 3-14