Hemianopsia

A 35-year-old woman comes to the office because of a six month history of progressively worsening headaches. She has also noticed blurred peripheral vision while driving. The patient does not report any head trauma or associated dizziness, weight changes, diplopia, or polyuria. Past medical history is unremarkable and she does not take any medications. Vitals are within normal limits. Physical examination demonstrates a bitemporal visual field defect. Laboratory studies reveal a prolactin level that is greater than 20 times normal and cranial imaging shows a large pituitary mass. Based on the diagram below, which of the following visual pathways is most likely disrupted in this patient?  The patient does not report any head trauma or associated dizziness, weight changes, diplopia, or polyuria. Past medical history is unremarkable and she does not take any medications. Vitals are within normal limits. Physical examination demonstrates a bitemporal visual field defect. Laboratory studies reveal a prolactin level that is greater than 20 times normal and cranial imaging shows a large pituitary mass. Based on the diagram below, which of the following visual pathways is most likely disrupted in this patient?