Orbital fracture is a risk of endoscopic sinus surgery because of the proximity of the sinuses to the orbit (A, frontal view; B, coronal section). (Reproduced and modified, with permission, from Snell RS, Katz J: Clinical Anatomy for Anesthesiologists. Appleton & Lange, 1988.) Source: Chapter 37. Anesthesia for Otorhinolaryngologic Surgery, Morgan & Mikhail's Clinical Anesthesiology, 5e Citation: Butterworth JF, IV, Mackey DC, Wasnick JD. Morgan & Mikhail's Clinical Anesthesiology, 5e; 2013 Available at: http://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/butt5/butt5_c037f001.png&sec=42807207&BookID=564&ChapterSecID=42800569&imagename= Accessed: October 07, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved