Figure 13a. (a) Sagittal T1-weighted MR image demonstrates posterior and superior elevation of the right cavernous internal carotid artery (arrows). (b) Composite MR angiogram obtained in a different patient shows posterior displacement of the right posterior cerebral artery (arrowhead) and lateral displacement of the right cavernous carotid artery (arrow). (c) Coronal T1-weighted MR image obtained in a third patient shows a tumor with extension to the right cavernous sinus and concomitant displacement and partial encasement of the right cavernous internal carotid artery (arrow).