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Selected MRI images confirm the presence of an extra-axial lesion arising from just lateral to the clivus and cavernous sinus. It is heterogeneous in signal with the more medial component demonstrated high T2 signal and variegated contrast enhancement, without restricted diffusion.
Features are consistent with a chondrosarcoma (histologically proven). The off-midline location and ring-like calcification make a chordoma much less likely.