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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.
Kidneys with a complete parenchymal bridge in the sinus, which is diagnostic for a duplex collecting system, were also excluded from the study. The children were between 1 month and 18 years old (mean age, 6.1 Â± 5.9 years).he objective of our study was to develop, by use of ultrasound, nomograms of renal parenchymal thickness, medullary pyramid thickness (height), renal length, and the ratio of medullary pyramid thickness to parenchymal thickness in healthy children.