Study participants will be admitted to the hospital for 8 to 10 days. They will undergo a complete physical and neurological exam and blood and urine tests. An electrocardiogram will be performed, and x-rays may be taken. On the morning of surgery, the patient will receive sedation intravenously. A tiny plastic tube called a catheter will be introduced into a vein in the groin through needles. The catheter will be passed through to the jugular bulb, right above the jugular vein, on the same side as the tumor. The patient will then be taken to the operating room for surgery. During surgery, not more than one quarter of a unit of blood will be removed through the catheter. The catheter will be removed before the patient enters the intensive care unit. Another MRI will be taken after surgery.