Inclusion Criteria:  Adult patients (age 18 years or older). Patients treated with surgery, followed by chemoradiation therapy, and currently under chemotherapy. Patients with a newly or enlarged enhancing lesion inside the radiation field at least three months after completion of radiation therapy. Patients with signed informed consent.  Exclusion Criteria:  Participants with safety contraindications to MRI examination (determined by standard clinical screening). Participants on hemodialysis or with acute renal failure. Participants who are pregnant, lactating or are planning to become pregnant during the study. Participants who are planning to farther a child during the study.