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The nasal cavity is a roughly cylindrical, midline airway passage that extends from the nasal ala anteriorly to the choana posteriorly.[1] It is divided in the midline by the nasal septum. On each side, it is flanked by the maxillary sinuses and roofed by the frontal, ethmoid, and sphenoid sinuses in an anterior-to-posterior fashion.[1] While seemingly simple, sinonasal anatomy comprises intricate and subdivided air passages and drainage pathways that connect the sinuses. See Image. Diagram of the Frontal Sinus Anatomy, Coronal View.