['This study was performed to determine the location of the natural ostium of the sphenoid sinus relative to the intact superior turbinate.', 'Forty-seven cadaveric specimens were examined. Mucosa over the sphenoethmoidal recess, superior turbinate, and posterior ethmoid was left intact. The position of the sphenoid sinus natural ostium relative to the superior turbinate was identified.', 'The sphenoid ostium was identified in all specimens. In all specimens, the sphenoid ostium was found to be medial to the intact superior turbinate, notwithstanding lateral deflection of the posterior few millimeters of the superior turbinate in some cases.'] Is the sphenoid sinus natural ostium consistently medial to the superior turbinate?