Table 2:
Conventional imaging characteristics of chondrosarcomas, chordomas, and metastases
| Chondrosarcoma | Chordoma | Metastasis | P Value | |
|---|---|---|---|---|
| Main location (petrous bone:clivus) | 9:6 | 1:13 | 5:25 | Pa = .08Pb = .14Pc = .65 |
| Cystic/necrotic changes | 8/15 | 7/14 | 10/30 | Pa = 1.0Pb = .22Pc = .33 |
| T2 hyperintensity or iso-/hypointensity relative to the brain parenchyma (T2 hyperintensity/total) | 10/15 | 9/14 | 9/30 | Pa = 1.0Pb = .027Pc = .049 |
| Enhancement patterns (heterogeneous/total) | 15/15 | 14/14 | 26/30 | Pa = 1.0Pb = .29Pc = .29 |
| Other metastatic lesions in the head and neck | NA | NA | 5/30 | NA |
Note:—Pa is obtained from a comparison between chondrosarcoma and chordoma, Pb is from a comparison between chondrosarcoma and metastasis, and Pc is from a comparison between chordoma versus metastasis.