Abbreviations: IOL, intraocular lymphoma; CNSL, central nervous system lymphoma; BG, basal ganglia; LMS, leptomeningeal seeding; IO MTX, intraocular methotrexate injection; HD MTX, high dose methotrexate; Ara-C, cytarabine; CYVE, high-dose cytarabine and etoposide; ORT, ocular radiotherapy; WBRT, whole brain radiotherapy; IT, intrathecal chemotherapy; procar, procarbazine; vinc, vincristine; HSCT, hematopoietic stem cell transplantation.