Figure 4.

(a) Ophthalmic division of the trigeminal nerve (V₁) using the 3D CRANI sequence. (b) 3D CRANI sequence. Increased caliber of the right infra orbital nerve (V₂) in a patient with Short lasting Unilateral Neuralgiform headache attacks with Conjunctival injection and Tearing (SUNCT) rhinorrhea and forehead sweating. (c) 3D CRANI sequence. Increased signal intensity is noted of the Vidian nerve (V₂) in the same patient as seen in (b). (d) 47-year-old male diagnosed with empty nose syndrome after repeated sinonasal procedures. Marked increase of caliber and signal intensity of both maxillary and infraorbital nerves (arrows) is seen. CRANI, CRAnial Nerve Imaging; SUNCT, short lasting Unilateral Neuralgiform headache attacks with Conjunctival injection and Tearing rhinorrhea and forehead sweating