Panitumumab-IRDye800 in Diagnosing Participants With Malignant Glioma Undergoing Surgery

This trial is testing a specially tagged antibody called panitumumab-IRDye800 that glows under a special light during surgery, helping surgeons more precisely identify and remove brain tumor tissue (glioblastoma) or a type of benign nerve tumor (vestibular schwannoma). **You may be eligible if...** - You are 18 years or older - You have been diagnosed or are suspected to have glioblastoma (a serious brain tumor) or a vestibular schwannoma (a benign tumor near the ear/balance nerve) - Surgery to remove the tumor is planned as part of your standard treatment - You are willing and able to attend all required visits and follow the study plan **You may NOT be eligible if...** - You have received an experimental drug in the past 30 days - You have had a heart attack, stroke, or serious heart or liver condition in the past 6 months - You have previously had a severe reaction to a monoclonal antibody (a type of targeted therapy) - You are pregnant or breastfeeding - Your ECG shows a specific heart rhythm abnormality - Certain blood test values are outside the acceptable range Talk to your doctor to see if this trial is right for you.