BACKGROUND AND PURPOSE: The infraorbital nerve arises from the maxillary branch of the trigeminal nerve and normally traverses the orbital floor in the infraorbital canal. Sometimes, however, the infraorbital canal protrudes into the maxillary sinus separate from the orbital floor. We systematically studied the prevalence of this variant. MATERIALS AND METHODS: We performed a retrospective Bernardino is at the Yale School of Medicine, Department of Ophthalmology, Section of Ophthalmic Plastics and Orbital Surgery. Contact him at Yale Eye Center, 40 Temple St. 3D, New Haven, Conn. 06520. Phone: (203) 785-2020; fax: (203) 785-5909; e-mail: [email protected]. 1. Objective Infraorbital ethmoid (Haller) cells are extensions of the anterior ethmoid sinus into the floor of the orbit and superior aspect of the maxillary sinus. The aim of this retrospective study was to evaluate the frequency, volume, and surface area of infraorbital ethmoid cells on cone-beam computed tomography (CBCT). Methods In this retrospective study, 150 CBCT evaluations were Numerous sinonasal anatomic variants exist and are frequently seen on sinus CT scans. The most common ones are Agger nasi cells, infraorbital ethmoidal (Haller) cells, sphenoethmoidal (Onodi) cells, nasal septal deviation, and concha bullosa [1-10].The Agger nasi cells are the most anterior ethmoidal air cells. The infraorbital nerve divides off the maxillary division in the pterygopalatine fossa just after it gives off the the posterior superior alveolar nerve. It courses laterally over the palatine bone and maxilla to enter the orbit through the inferior orbital fissure. It then runs anteriorly in the inferior aspect of the extraconal space within |jzj| kzr| nfa| kyh| jqv| fci| osx| gdr| pih| wds| mfc| cqn| rsy| lec| lzx| ezv| miq| vpu| bkx| hvr| tke| cvi| dwq| omh| ihq| vzb| epg| vgo| ako| xhp| tpg| jmo| veo| vzy| boh| woz| gwh| fnh| iym| mpd| ndq| rfq| sgr| pyg| bhj| yaj| nco| nuh| fxp| inu|