Study of Immunotoxin, MR1-1

Exclusion Criteria

• •Patients who are pregnant, breast-feeding, or unwilling to practice an effective method of birth control.
• •Patients with known potentially anaphylactic allergic reactions to iodine or gadolinium-DTPA.
• •Patients who cannot undergo MRI due to obesity or to having certain metal in their bodies (specifically pacemakers, infusion pumps, metal aneurysm clips, metal prostheses, joints, rods or plates).
• •Patients that have not recovered from the toxic effects of prior chemotherapy and/or radiation therapy.
• •Patients with an impending, life-threatening cerebral herniation syndrome.
• •Patients with subependymal or CSF disease.
• •Patients who are under the age of 18 years.