Protrusion of the infraorbital canal into the maxillary sinus
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Protrusion of the infraorbital canal into the maxillary sinus is a type of variant anatomy where the infraorbital canal traverses below the level of the orbital floor and often through the maxillary sinus to varying degrees. It can be detected on sinus CT and cone beam computed tomography and it is beneficial to be reported by a radiologist in raising caution to avoid potential injury to the infraorbital nerve during a surgical procedure. A bony septum usually attaches the infraorbital canal to a maxillary sinus wall.
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