Classification of Osteosarcoma
| Classification | % |
|---|---|
| Primary high-grade, intramedullary | 75 |
| Mixed pattern (73%) | |
| Bone rich/sclerosing (9%) | |
| Cartilage rich (5%) | |
| Spindle cell rich | |
| Malignant histiocyte rich | |
| Telangiectatic | |
| Small cell rich (Ewing-like) | |
| Benign giant cell rich | |
| Epitheloid cell rich | |
| Primary low-grade, intramedullary | 4–5 |
| Fibrous dysplasia-like (50%) | |
| Nonossifying fibroma-like (25%) | |
| Osteoblastoma-like (15%) | |
| Chondromyxoid fibroma-like (10%) | |
| Secondary intramedullary | 6 |
| Multifocal | 1–2 |
| Intracortical | 0.2 |
| Juxtacortical | 7–10 |
| Parosteal (65%) | |
| Periosteal (25%) | |
| High-grade surface (10%) | |
| Osteosarcoma of jaw | 6 |
Classification according to Mirra (1).