Inclusion Criteria:  Patients over 18 years and under 90 years Patients with KPS ≥70 Patients with NSCLC, melanoma, breast cancer or renal cancer as primary tumor Maximum of three brain metastases on the diagnostic MRI Tumor volume of 8-20 ccm3 on the diagnostic MRI Lobular brain metastases Patients without any contraindications for both treatment options Written, signed informed consent for study particaption after study explanation  Exclusion Criteria:  Patients under 18 years and over 90 years Patients with KPS <70 Patients with other primary tumor More than three brain metastases on the diagnostic MRI Tumor volume <8 or >20 ccm3 on the diagnostic MRI Patients with contraindications for both treatment options