Fig. 16.2 Coronal T2W MRI image through the belly of the pons demonstrates the large fibers of the trigeminal nerves (arrows) on both sides of the pone, extending anteriorly

Fig. 16.3 Axial T1W MRI image through the trigeminal cisterns (arrows) shows the normal peripheral enhancement of the dural surfaces, without central enhancement

Fig. 16.4 Coronal T2W (CSF bright) MRI image through the anterior trigeminal cisterns demonstrates the normal semilunar-shaped trigeminal ganglions (arrows) inferiorly and laterally within the trigeminal cisterns

Fig. 16.5 Coronal T1W postcontrasted MRI image immediately anterior to the trigeminal cistern shows the normal V3 (mandibular) divisions extending inferiorly through foramen ovale (arrows). The nerves themselves do not normally enhance, although there is normally enhancement of the vasculature surrounding the nerves in the foramen; this is nicely demonstrated on the left side

Fig. 16.6 Coronal T1W postcontrasted MRI image through the pituitary gland demonstrating the normal cavernous sinuses on both sides of the sella with normal internal carotid artery dark oval flow voids. The nonenhancing foci seen laterally and inferiorly are the normal V2 division nerves (arrows) of the trigeminal nerves within the lateral and inferior dural fascial sleeves of the cavernous sinus. The nonenhancing V1 divisions are seen immediately superior to V2 on both sides of the cavernous sinus