RecruitingPhase 1Drug trialLoncastuximab Tesirine and Rituximab Following Stereotactic Radiosurgery in Patients With Central Nervous System Lymphomas (SOLAR)The purpose of this clinical trial is to learn if drugs loncastuximab tesirine and rituximab (lonca-R) after stereotactic radiosurgery are safe and effective for treatment of central nervous system lymphomas.