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Surg Radiol Anat. 2015 Nov;37(9):1149-53. doi: 10.1007/s00276-015-1468-x. Epub 2015 Apr 1.

Infraorbital canal bilaterally replaced by a lateroantral canal.

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Division of Anatomy, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, 8, Eroilor Sanitari Blvd., Sector 5, 050474, Bucharest, Romania.
Division of Oral Implantology, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
Department of Anatomy, "Victor Babeş" University of Medicine and Pharmacy, Timişoara, Romania.


The infraorbital canal (IOC) normally courses above the maxillary sinus in the orbit floor. During a retrospective study of cone beam computed tomography (CBCT) scans, we found a previously unknown variant of the IOC. The IOCs were absent, being replaced by lateroantral canals coursing around and not above the maxillary sinus to open at infraorbital foramina which were located above the second upper premolar teeth. On coronal multiplanar reconstructions, the lateroantral canals were located anatomically at the outer limit of the zygomatic recess of each maxillary sinus, while the upper wall of the sinus was devoid of any canal. Such rare variant should be kept in mind by dental practitioners and surgeons, as it can determine modifications of common procedures. In this regard, the anatomy of maxilla, as well as mandible, should be evaluated in CBCT on a case-by-case basis.


Cone beam computed tomography (CBCT); Infraorbital nerve; Maxillary nerve; Maxillary sinus; Orbit

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