Figure 3-15.

Left Horner syndrome from a left internal carotid artery dissection. This patient presented with pain over the left eye and had one episode of sudden visual loss in the left eye, lasting a few minutes. A left Horner syndrome is present with mild decreased left palpebral fissure from mild left upper lid ptosis. The left pupil is smaller than the right pupil, and the amount of anisocoria increases in the dark.

Reprinted with permission from Biousse V, Newman NJ, Thieme.1 © 2009 Thieme Medical Publishers, Inc.