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**Images: [http://path.upmc.edu/cases/case598.html Secondary osteosarcoma - several images (upmc.edu)]. | **Images: [http://path.upmc.edu/cases/case598.html Secondary osteosarcoma - several images (upmc.edu)]. | ||
*Gnathic - jaw bones; usu. chondroblastic. | *Gnathic - jaw bones; usu. chondroblastic. | ||
How to remember: | |||
*Convention ''FOC'' = fibroblastic, osteogenic, chondroblastic. | |||
*Low-grade central. | |||
*High-grade surface. | |||
*Parosteal. | |||
*Periosteal. | |||
*Small cell. | |||
*Secondary. | |||
*Telangiectatic. | |||
==Giant cell tumour of bone== | ==Giant cell tumour of bone== |
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