Pituitary tumor. There is an enhancing low T1 and high T2 signal right sellar tumor with suprasellar extension, as well as possible peritumor cyst formation along the superior aspect of the mass, which overall measures up to 26 mm and exerts marked mass effect upon the optic apparatus, mainly on the right side, and upon the inferior right frontal lobe. There is also mass effect upon the right cavernous sinus, where the tumor abuts and perhaps encases a portion of the right internal carotid artery. Furthermore, the mass expands the sella inferiorly, with protrusion into the right sphenoid sinus.
A right sellar tumor with suprasellar extension measuring up to 26 mm exerts mass effect upon the optic apparatus and likely represents a pituitary macroadenoma. 