- 1% of all bone neoplasms
- 5-25 years
- M:F = 2.7:1
- Mono-arthropathy
- Epiphysis of a long bone
- 50% around knee
- Proximal femur and humerus commonly involved
- Eccentric in epiphysis
- With partial closure of growth plate, extends to metaphysis
- Apophysis and sesamoid bones may be involved
- Calcaneus and talus may be involved
- Commonest tumor of patella
Imaging
- Spherical or lobular
- Fine sclerotic margin
- 1-4 cm in size
- Matrix mineralization in 30%
- Linear metaphyseal periostea reaction seen in long bones
- Fluid fluid levels in MRI when secondarily involved by aneurysmal bone cysts
- A low signal intensity rim is characteristic
- Differentials: Brodie abscess in children. Adults – subchondral cysts, clear cell chondrosarcoma
Read more
Weatherall, Paul T., et al. “Chondroblastoma: classic and confusing appearance at MR imaging.” Radiology 190.2 (1994): 467-474.
Rybak, Leon D., Daniel I. Rosenthal, and James C. Wittig. “Chondroblastoma: radiofrequency ablation—alternative to surgical resection in selected cases.” Radiology 251.2 (2009): 599-604.
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