II. Epidemiology

  1. Most common under age 20 years old (70% of cases)

III. Pathophysiology

  1. Benign neoplasm arising in bone (esp. long bones)
  2. Lesion center contains Osteoblasts that produce both osteoid and to a lesser extent, bone
  3. Lesion surrounded by hypervascular sclerotic bone, that limits growth

IV. Symptoms

  1. Focal night pain

V. Signs

  1. Leg Length Discrepancy may occur (due to asymmetric growth)
  2. Focal findings may occur
    1. Localized swelling
    2. Muscle atrophy or contractures may form

VI. Imaging

  1. XRay
    1. Bone lucency with central, core density
  2. MRI
    1. Indicated in non-diagnostic XRay

VII. Management

  1. NSAIDs
  2. Lesion destruction (surgical excision or radiofrequency ablation)
    1. Indicated in severe pain or persistent course
    2. Lesions may recurr after excision

VIII. Course

  1. Lesions typically resolve spontaneously over months to years

IX. References

  1. Gardiner (2018) Crit Dec Emerg Med 37(5): 3-14

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