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The sphenoid sinus is a bony cavity lined with mucosa and filled with air. It is located behind the roof of the nose.
The sella turcica (Turkish saddle) is a spherical bony cavity located in the roof of the sphenoid sinus. It contains the pituitary gland. Whenever there is a tumor in the pituitary gland, the sella turcica enlarges and protrudes into the sphenoid sinus.