Ota Yasushi, Frontal Sinus Cyst Surgery Complicated by Central Retinal Artery Occlusion, Journal of Otolaryngology Advances, Volume 1, Issue 3, 2016, Pages 17-23, ISSN 2379-8572, https://doi.org/10.14302/issn.2379-8572.joa-14-531. (https://oapgroup.org/joa/article/246) Abstract: Central retinal artery occlusion (CRAO) is a retinal ischemic disorder associated with sudden loss of vision and has a poor prognosis. We report a case of CRAO that occurred during frontal sinus surgery involving craniotomy in a patient with a frontal sinus cyst. The prognosis for treatment after the acute phase is generally unfavorable; however, aggressive treatment is recommended for patients with visual acuity of “hand motion” or better within 1 day after onset. This case highlights the need for informed consent prior to nasal or paranasal sinus surgery, including mention of the possibility of CRAO as a complication. Keywords: CT; MRI; median drainage; complication