Fig. 19 A. A patient underwent endoscopic exploration of the right ethmoid and maxillary sinus for persistent epistaxis. Postoperatively the patient demonstrates right proptosis, restricted extraocular movements of the right eye, and a dilated right pupil. Instillation of 0.1% pilocarpine resulted in miosis on the right and no change on the left. Computed tomography (CT) shows a vessel clip lateral to the optic nerve (arrow), near the position of the ciliary ganglion. B. Coronal CT scan showing the clip lateral to the optic nerve (arrow).