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5mm with a range of 2.5-18 (12.45 90th percentile). Although the distance between the choanal edge and PSA is 8.5mm on average, due to its variability, a distance of at least 12.45mm for the opening of the sphenoidal sinus in the ETA approach should be considered as a safety margin. Although the distance between the choanal edge and PSA is 8.5 mm on average, due to its variability, a distance of at least 12.45 mm for the opening of the sphenoidal sinus in the ETA approach should be considered as a safety margin. Variations of the peripher
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