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Bi-dimensional slices of bilateral SESs (A – axial slice; B – left sagittal slice; C – right sagittal slice) and MSs (D – coronal slice). 1: Right SES; 2: Left SES; 3: Right superior turbinate; 4: Sphenoethmoidal recess; 5: Van Alyea’s elevation; 6: Posterior superior recess of the posterior wall of the left MS; 7: Pterygoid recess of the posterior wall of the left MS; 8: Right superior nasal turbinate inserted onto the MS wall. SES: Sphenoethmoidal sinus; MS: Maxillary sinus
