MRI images of patient's brain. (A, B) T1- and T2- weighted MRI scans taken two years prior to current presentation. (C) T1-weighted MRI scan of patient's brain, revealing a partly vesicular hyperintense, and slightly increased (compared to A and B) intrasellar and suprasellar mass of 16 mm in diameter, with progressive compression of the prechiasmatic portions of her optic nerves bilaterally. (D) T2-weighted MRI scan showing the vesicular portion as hypointense; normal pituitary tissue could not be clearly delineated. (E, F) There was no evident enhancement on T1-weighted imaging after intravenous administration of gadolinium. (G, H) An MRI scan taken 16 months postoperatively showed regular display of the remaining pituitary gland with good chiasmatic decompression and no signs of tumor recurrence.