What's the most likely diagnosis?

• 21 year-old with lump near knee

1. Osteoblastoma
2. Osteochondroma
3. Osteosarcoma
4. Chondroblastoma
5. Giant Cell Tumor

Answer:

 

2. Osteochondroma

 

 

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General Considerations

• Osteochondroma is the most common benign bone tumor and the most common skeletal neoplasm
• They account for approximately 35% of all benign bone tumors and 9% of all bone tumors
• They are cartilage-capped bony projections from the external surface of a bone
• They occur only in bones which form by enchondral bone formation and most commonly found around the knee (40%) and shoulder, although they can occur in any bone
• Almost all are diagnosed in patients under the age of 20 with a marked male:female predominance (3:1)
• They grow until skeletal maturity and then stop growing when the epiphyseal plate fuses, although the cartilage cap can continue to grow slowly until about age 30
• Osteochondromas tend to occur near an epiphyseal growth plate and grow away from the physis

 

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