- Magnetic resonance imaging suspected brain metastases; patients with brain lesion(s) not univocal as brain metastases must have negative radiolabeled leukocyte brain scan to rule out infectious non-malignant disease; all neuroradiological studies (baseline and treatment outcome evaluation), except for emergency exams must be performed after 10 days of unchanged schedule of dexamethasone, and obtained in the axial-coronal-sagittal planes in T1 and T2 before and after gadolinium enhancement.