The diagnosis is made clinically based on the rash affecting only one dermatome associated with the ophthalmic division of cranial nerve V (trigeminal nerve).
Lacrimal gland enlargement may be seen. CT and MRI may also show "stretching" and apical crowding of the optic nerve with an enlarged superior ophthalmic vein.
泪腺增大也可以出现，CT和MRI可能表现为“拉胀”，视神经尖端拥挤，眼上静脉扩张。
3
Results: the frontal, nasociliary and lacrimal nerve, divisions of ophthalmicnerve, entered the orbit via the superior orbital fissure.