This study will evaluate a single intravenous dose of panitumumab-IRDye800 (pan800) in subjects with intracranial lesions who are scheduled to undergo standard-of-care neurosurgical resection. The study drug will be administered 1-5 days prior to surgery, after which participants will undergo their planned procedure with intraoperative near-infrared fluorescence imaging to assess tumor visualization. Following the infusion, subjects will be monitored for immediate adverse events, and a member of the study team will continue safety follow-up through postoperative assessments and a Day 15 follow-up contact. Participants will otherwise continue to receive standard-of-care evaluation and treatment for their intracranial disease at the discretion of their treating physicians.