7T MRI Scan for the Early Detection of Melanoma Brain Metastases

PRIMARY OBJECTIVE: I. Assess the potential superiority of contrast-enhanced (CE) 7T MRI by comparing to standard of care CE 3T MRI in detecting occult brain metastases lesion at time of diagnosis of new brain metastases. SECONDARY OBJECTIVE: I. Describe the imaging characteristics of melanoma brain metastases on 7T MRI of the brain. EXPLORATORY OBJECTIVE: I. Evaluate incidence of diagnosis of leptomeningeal disease on CE 7T MRI brain. OUTLINE: Within 2 weeks of initial standard of care 3T MRI, patients undergo 7T MRI scan with and without contrast over 1-2 hours.