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	P^a = .08P^b = .14P^c = .65
Cystic/necrotic changes	8/15	7/14	10/30	P^a = 1.0P^b = .22P^c = .33
T2 hyperintensity or iso-/hypointensity relative to the brain parenchyma (T2 hyperintensity/total)	10/15	9/14	9/30	P^a = 1.0P^b = .027P^c = .049
Enhancement patterns (heterogeneous/total)	15/15	14/14	26/30	P^a = 1.0P^b = .29P^c = .29
Other metastatic lesions in the head and neck	NA	NA	5/30	NA

Note:—P^a is obtained from a comparison between chondrosarcoma and chordoma, P^b is from a comparison between chondrosarcoma and metastasis, and P^c is from a comparison between chordoma versus metastasis.