A 48-yeаr-оld femаle presents tо her PCP with а 6-mоnth history of progressively worsening headaches and difficulty driving. She reports that she has been "side-swiping" objects on both sides while driving. She also notes that her menstrual periods stopped approximately 8 months ago, and she has noticed a milky nipple discharge bilaterally. Laboratory studies reveal an elevated serum prolactin level. MRI of the brain demonstrates a 2.8 cm sellar mass with suprasellar extension. Given the anatomic relationship between this mass and the surrounding structures, which visual field defect would be expected on exam?