Parasagittal T1-WI demonstrates a large heterogeneous, lobulated mass involving
portions of the clivus and parasellar structures. Axial T2-WI demonstrates an extraaxial,
heterogeneous, lobulated mass. There is suggestion that the epicenter may be near the
junction of the posterior clinoid process and the clivus. Realizing that the sphenooccipital
suture is located here is a potential clue to the correct diagnosis. Note the T2 hyperintensity
arranged in a lobular fashion. The supraclinoid carotid is both displaced and encased.
Axial FLAIR, axial T2, and coronal T1-WI demonstrate significant mass effect
on the medial right temporal lobe and right cerebral peduncle.
T1-WIs after gadolinium and fat saturation nicely demonstrate the typical peripheral
enhancement in a lobular fashion. Axial CT better demonstrates the nature of the lesion.
Note that the lesion appears to contain a matrix of arcs and whirls.
MIP image from TOF MRA demonstrates reduction in caliber of the distal right cavernous and
supraclinoid carotid. Note how the right distal carotid, MCA, ACA, and PCA are all attenuated
and stretched. Injection of the right internal carotid demonstrates narrowing secondary to
encasement. The ophthalmic artery remains patent. The mass is mildly hypervascular.
Key words: mri mra angiogram angiography tumor neoplasia
Chondrosarcoma of skull base