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Case of the Week 300! 
What's the most likely diagnosis?
- 10 year-old male with pain in shoulder
- Metastatic disease
- Ewing sarcoma
- Eosinophilic granuloma
- Solitary plasmacytoma
- Unicameral bone cyst
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Answer:
5. Unicameral Bone Cyst
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Unicameral Bone Cyst
General Considerations
- Common (3-5% of primary bone tumors)
- Benign
- Solitary lesion
- Most common in proximal humerus and femur
- Also Iliac bone and calcaneous, especially over age 20
- Most common between 4-10 years old
- Males:Females 3:1
- Filled with clear, yellowish fluid
- May contain giant cells and hemosiderin
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