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Before 5 Years. The sphenoid sinuses begins to form at age 2, and are air-filled and visible on X-rays by age 5. The sphenoid sinuses sit behind the eyes and are located deeper than the other sinuses, behind the ethmoid sinuses. The right and left sphenoid are next to each other, only separated by the septum, a thin plate of bone.
Normal findings on an X-ray of the sinuses will show: 1  Normal bone structure. 2  No evidence of fluid in the sinuses. 3  No thickening of the mucous membrane.hat To Think About. 1  X-rays of the sinuses may be unreliable in diagnosing sinusitis in babies under 1 year of age. 2  The sinus cavities are not completely developed in children. 3  A partly developed sinus on X-ray can look like it is infected.