Multicentre Implementation and Validation of a Molecular Diagnostic for VitreoRetinal Lymphoma

The goal of this observational study is to gain new insights into the changes in proteins, genes and other molecular biological substances in the aqueous humour, vitreous humour, blood serum and, in rare cases, retina/choroid samples in patients with ocular lymphoma disease. The hope is that this will expand the understanding of the mechanisms of the disease and thus contribute to improved and simplified diagnosis and treatment strategies in the future. The aim is the inclusion of at least 220 patients during the study period. The main questions it aims to answer are: * to evaluate the diagnostic quality of extended molecular diagnostics (based on standard work-up) of vitreous samples for the specific VitreoRetinalLymphoma (a type of ocular lymphoma disease) diagnosis in comparison to standard work-up alone. * To monitor VRL patients as part of regular tumour follow-up over a period of 24 months to determine the value of biomarkers with regard to treatment response and development of recurrence in the eye. Similarly, the vitritis patients are followed up by telephone every six months for a period of 24 months, during which questions of any interim occurrence of a VRL or other cancerous tumors are asked according to a defined catalogue of questions.