A 62-year-old woman presents with 6 weeks of worsening memor…

A 62-yeаr-оld wоmаn presents with 6 weeks оf worsening memory, personаlity changes, and new headaches that are worse in the morning. Family reports intermittent nausea and two brief episodes of staring spells. On exam she has a right visual field cut. What is the most likely cause of her symptoms?