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*High grade surface. | *High grade surface. | ||
*Secondary - arise due to something else (e.g. [[Paget disease of the bone]] (~80% of secondary osteosarcomas), radiation (~15% of secondary osteosarcomas)).<ref>URL: [http://www.rsna.org/REG/publications/rg/afip/privateM/1997/0017/0005/1205/6.htm http://www.rsna.org/REG/publications/rg/afip/privateM/1997/0017/0005/1205/6.htm]. Accessed on: 8 April 2011.</ref> | *Secondary - arise due to something else (e.g. [[Paget disease of the bone]] (~80% of secondary osteosarcomas), radiation (~15% of secondary osteosarcomas)).<ref>URL: [http://www.rsna.org/REG/publications/rg/afip/privateM/1997/0017/0005/1205/6.htm http://www.rsna.org/REG/publications/rg/afip/privateM/1997/0017/0005/1205/6.htm]. Accessed on: 8 April 2011.</ref> | ||
**Images: [http://path.upmc.edu/cases/case598.html Secondary osteosarcoma - several images (upmc.edu)]. | |||
*Gnathic - jaw bones; usu. chondroblastic. | *Gnathic - jaw bones; usu. chondroblastic. | ||
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