-Case Reports-

A Case of a Mucocele in an Onodi Cell

Manabu Nonaka, Akira Fukumoto, Reiko Nonaka, Chika Ozu and Shunkichi Baba

Department of Head & Neck and Sensory Organ Science, Graduate School of Medcine, Nippon Medical School

Onodi cells have been defined as posterior ethmoid cells that have pneumatized laterally and superiorly to the sphenoid sinus. They are often close to the optic nerve or the internal carotid artery. A patient complained of a sudden decrease in left eye visual acuity and left eye pain due to formation of a primary mucocele in an Onodi cell. A coronal computed tomography scan and magnetic resonance imaging were useful for diagnosing the mucocele.

J Nippon Med Sch 2007; 74: 325-328

Keywords
Onodi cells, primary mucocele, visual disturbance

Correspondence to
Manabu Nonaka, Department of Otorhinolaryngology, Nippon Medical School Tama Nagayama Hospital, 1-7-1 Nagayama, Tama-city, Tokyo 206-8512, Japan
nonaka@nms.ac.jp

Received, April 17, 2007
Accepted, May 14, 2007