FINDINGS Figure 192-1. Axial post-contrast T1WI through the inferior posterior fossa. There are multifocal meningeal enhancements bilaterally along the cerebellum and brainstem with irregular enhancement in the right near the Meckel cave (arrow). Figure 192-2. Axial post-contrast T1WI through the pons. There is a lobulated, enhancing dural-based mass (m) extending from the region of the right Meckel cave posterolaterally along the right tentorial edge (arrow). Figure 192-3. Coronal post-contrast T1WI through the mass. The mass (m) extends from the Meckel cave to the cerebellopontine angle (CPA), as well as scattered leptomeningeal enhancing foci predominantly around the brainstem and upper cervical cord. Figure 192-4. Post-contrast coronal T1WI through the pituitary fossa. There is enhancement and thickening of the infundibulum and undersurface of the optic chiasm (arrows) in addition to the mass (m) extension into the right cavernous sinus.
DIFFERENTIAL DIAGNOSIS
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