Hyperpolarized Carbon C 13 Pyruvate in Diagnosing Glioma in Patients With Brain Tumors

This study is testing a special MRI imaging technique using a substance called hyperpolarized carbon-13 pyruvate to get a better picture of brain tumors (gliomas) before surgery, helping doctors understand how the tumor is behaving at a chemical level. **You may be eligible if...** - You are 18 years or older - You have been diagnosed with or are suspected to have a primary brain tumor and are scheduled for surgery - You are already enrolled in a related brain tumor study at the same institution - Your kidney function is adequate (the imaging contrast agent is safe for you) - You are willing and able to undergo MRI scans before the procedure **You may NOT be eligible if...** - You have a contraindication to MRI (such as certain metal implants) - You are not able to give informed consent - You have kidney failure that would make contrast dye unsafe - You are not a candidate for tumor removal surgery Talk to your doctor to see if this trial is right for you.