How would you empirically manage a large sellar/suprasellar mass with encasement of the right cavernous and terminal internal carotid arteries?

Knowing the histology of the mass would really help in creating more accurate treatment recommendations. A biopsy of a sellar mass is usually accomplished by an endonasal-endoscopic transsphenoidal approach utilizing the expertise of an ENT surgeon and a skull-base neurosurgeon. However, in this cas...