What's the most likely diagnosis?

• 12 year-old male with 4 months of leg pain

1. Healing fracture
2. Aneurysmal bone cyst
3. Renal cell carcinoma
4. Ewing sarcoma
5. Osteomyelitis

Answer:

 

4. Ewing sarcoma

 

 

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Ewing Sarcoma

General Considerations

• Second most common malignant bone tumor in children (after osteosarcoma)
• Accounts for approximately one-third of all primary bone tumors
• More common in males than females
  • More common in Caucasians
• Occurs between the ages of 5-30 years
  • Highest frequency between 5-15 years
• Rare over age 30
• Location
  • Arise in medullary cavity, usually of long bones in the lower extremities
  • Most commonly occurs in long bones and pelvis
  • Most occur in femur, pelvis, tibia, and humerus
  • But they can occur in virtually any bone
  • Commonly involves metadiaphysis of long bones

 

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