primary central nervous system (CNS) lymphoma

Definition of primary central nervous system lymphoma
National Cancer Institute

primary central nervous system lymphoma

(PRY-mayr-ee SEN-trul NER-vus SIS-tem lim-FOH-muh)
Cancer that forms in the lymph tissue of the brain, spinal cord, meninges (outer covering of the brain), or eye (called ocular lymphoma). Also called PCNSL and primary CNS lymphoma.

Source: NCI Dictionary of Cancer Terms