ENT Congenital Lesions and Stridor f45d4e97 Sphenoidal sinus opens into: A Superior meatus B Inferior meatus C Middle meatus D Spheno-ethmoidal recess High-Yield Explanation (d) Spheno-ethmoidal recess(Ref. Cummings, 6th ed., 659)The Sphenoid sinus opens into the spheno-ethmoidal recess just above the superior turbinate.