Medical Terms Learned today: Enchondroma of the scaphoid

Enchondroma of the scaphoid

Enchondroma: The most common neoplasm of the small bones in the hands and feet, accounting for 10-25% of cases. The age distribution is wide, ranging from 5-80 years. The long tubular bone, e.g. proximal humerus and femur are second common site. Uncommon in the flat bones. The tumours are usually located in the metaphysis, showing matrix calcification with well-defined margin. The minute endosteal erosion may be seen. In case of extensive erotion, low grade chondrosarcoma should be considered in the differential diagnosis. Macroscopically, most tumours measure less than 3cm. They frequently have a multinodular architecture, with nodules separated by trabecula of bone marrow.
Periosteal enchondroma: Uncommon benign cartilage tumours arising from thr periosteum, accounting for less than 2% of the cases. Proximal humerus is characterstic location. Occasionally, they can be more cellular and show greater degree of nuclear pleomorphism and binucleation.

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