What is a sellar mass?

Answer 1

A sellar mass is a tumor pressing on part of the brain called the sella turicia. This is the place where the pituitary gland sits.
Pituitary tumors usually extend upward. This can result in compression of the place where the optic nerves cross. This area lies on top of the pituitary.
Compression of the optic area can lead to partial blindness (where vision is missing in the outer half of both the right and left visual field). When there is no trauma, this clinical finding means that there is a pituitary tumor.