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FIG 4. Sagittal enhanced 3D CISS image through the right side of the Meckel cave in a 54-year-old man. Sensory root (SeR) is displayed from its apparent origin at the pons (P) to the entrance of the cave. Trigeminal ganglion (thick white arrow) is at the anteroinferior border of the cave. Anterior margin of the enhancing ganglion is clearly distinguished from the less-enhancing dura (white arrowhead) of the cave. Lips of the ganglion (thin white arrows) define the sinus ganglii (short black arrow) from which small sensory rootlets (long black arrows) arise. Maxillary nerve (V2) is depicted along the inferior border of the cavernous sinus, surrounded by venous channels (black arrowhead) en route to the foramen rotundum (FR). CA = carotid artery, MoR = motor root of the trigeminal nerve at its point of exit, PC = prepontine cistern, TE = cerebellar tentorium, TL = temporal lobe.
