RecruitingPhase 1Drug trialHyperpolarized Carbon C 13 Pyruvate in Diagnosing Glioma in Patients With Brain TumorsThis trial studies how an imaging agent, hyperpolarized carbon C 13 pyruvate, works in diagnosing glioma in patients with brain tumors. Giving hyperpolarized carbon C 13 pyruvate before an advanced imaging technique called a magnetic resonance spectroscopic imaging (MRSI) scan may help researchers better diagnose glioma in patients with brain tumors.