Figure 5b. (a) Axial T1-weighted MR image shows a small, hypointense mass in the right side of the clivus (arrow). (b) Sagittal T1-weighted MR image obtained in a different patient shows a large, hypointense soft-tissue mass that arises from the distal clivus with anterior extension into the nasopharynx (arrows) and extradural extension into the posterior fossa (arrowhead).