CSF interleukin 6 is a useful marker to distinguish pseudotumoral CNS inflammatory diseases from primary CNS lymphoma.

Ungureanu A, Le Garff-Tavernier M, Costopoulos M, Parratte T, Brinet A, Durand H, Gaultier C, Hurstel R, Alamome I, Sellal F, Ahle G.J Neurol. 2021 Aug;268(8):2890-2894. doi: 10.1007/s00415-021-10453-5. Epub 2021 Feb 20.PMID: 33609156