Table I.
Cases not verified as bone osteosarcoma.
| Cases | % | |
|---|---|---|
| Spindle cell non-osteosarcoma arising from bone tissue | 104 | 53.6 |
| Spindle cell non-osteosarcoma arising from soft tissue | 7 | 3.6 |
| Spindle cell non-osteosarcoma, uncertain origin | 1 | 0.5 |
| Extraskeletal osteosarcoma | 36 | 18.6 |
| Chondrosarcoma | 12 | 6.2 |
| Chondrosarcoma with a component of osteosarcoma | 1 | 0.5 |
| Chondroblastoma | 1 | 0.5 |
| Carcinosarcoma | 4 | 2.1 |
| Adenocarcinoma | 3 | 1.5 |
| Ewing sarcoma | 3 | 1.5 |
| Giant-cell tumour of bone | 2 | 1.0 |
| Chordoma | 1 | 0.5 |
| Liposarcoma | 1 | 0.5 |
| Mesothelioma | 1 | 0.5 |
| Mesenchymal tumour | 1 | 0.5 |
| Neuroblastoma | 1 | 0.5 |
| Osteoblastoma | 1 | 0.5 |
| Unclassified sarcoma | 3 | 1.5 |
| Uncertain diagnosis, but not osteosarcoma | 8 | 4.1 |
| Not representative biopsy | 3 | 1.5 |
| Total | 194 | 100 |