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Patient 1. Axial (A) and coronal (B) postgadolinium T1-weighted MR images demonstrate an irregular enhancing mass involving the right pons, the expected location of trigeminal nuclei, the root entry zone, and the cisternal segment of the right trigeminal nerve (arrow). The normal left trigeminal nerve is marked on the coronal image (arrowhead). This patient presented with right facial numbness.
