57 year old, male, came with a bilateral vision and left sided facial weakness, ataxia and short-term memory loss. MRI showed a large intrasellar mass with considerable suprasellar extension and chiasmatic compression with the displacement of the inferior frontal lobe.

Hormone readings showed increased levels of FSH and LH of 46.3?mIU/mL and 12.3?mIU/mL, respectively. What should be the prognosis?