Registry of Patients With Brain Tumors Treated With STaRT (GammaTiles)

Inclusion Criteria: 1. Patients who undergo maximum safe resection of intracranial neoplasm(s) AND implantation of GammaTiles. 2. Willing and able to provide informed consent and to participate in all evaluations. Exclusion Criteria: 1. Inability to undergo pre-operative and post-operative imaging for disease and implant assessment. 2. Major medical or psychiatric illness, which, in the investigator's opinion would prevent completion of treatment, ability to complete assessments at the time of enrollment, and/or interfere with follow ups. 3. Subjects who, in the investigator's opinion, are unable to understand the protocol or to give informed consent, have a history of poor cooperation, noncompliance with medical treatment, or difficulty in returning for follow up care. A legally authorized representative may provide consent if the potential subject lacks the capacity to provide consent themselves.