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Case of the Week 245 
What's the most likely diagnosis?
- 25 year-old with pain in hand
- Enchondroma
- Sarcoid
- Neuroblastoma
- Paget disease
- Ganglion cyst
Answer:
1. Enchondroma with a pathologic fracture
More (Click Discussion Tab)
Enchondroma
General considerations
- Benign cartilaginous tumor
- Develops in the medullary cavity
- Usually solitary, although they can occur as multiple lesions in syndromes to be discussed
- Arise from ectopic rests of hyaline cartilage
- Occur mostly in 2nd to 3rd decade
- Most common site is small bones of the hands and feet
- Most occur in the proximal phalanx
- Most common tumor of the hand
- Also occur in the humerus, femur, tibia and ribs
- In long bones, their calcification is similar to an intramedullary bone infarct
- Bone infarcts tend to have a well-circumscribed, sclerotic margin
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