Primary Objective: To evaluate whether additional follow up brain MRI in patients with non-squamous stage III nonsmall cell lung cancer who were previously treated with curative intent radiation therapy reduces the rate of symptomatic brain metastasis presentation as compared to historical controls.~Secondary Objectives:~To estimate time to brain failure in patients with non-squamous stage III nonsmall cell lung cancer previously treated with curative intent radiation therapy who undergo additional surveillance brain magnetic resonance imaging.~To describe documented brain metastasis(es) characteristics in patients with non-squamous stage III nonsmall cell lung cancer previously treated with curative intent radiation therapy who undergo additional surveillance brain magnetic resonance imaging.~OUTLINE:~Patients undergo MRI with or without gadolinium contrast intravenously (IV) as well as blood sample collection on study.~Patients are followed for approximately 780 days from the first treatment of radiation or until death, whichever occurs first
The purpose of this research is to see if monitoring the brain using magnetic resonance imaging (MRI) after radiation therapy will allow investigators to find cancer that has spread to the brain (brain metastases) before it causes symptoms.