CSF and clinical data are useful in differentiating CNS inflammatory demyelinating disease from CNS lymphoma

It is often difficult to diagnose central nervous system (CNS) inflammatory demyelinating diseases (IDDs) because they are similar to CNS lymphoma and glioma.To evaluate whether cerebrospinal fluid (CSF) analysis can differentiate CNS IDDs from CNS lymphoma and glioma.We measured CSF cell counts; concentrations of proteins, glucose, interleukin (IL)-6, IL-10, soluble IL-2 receptor (sIL-2R), and myelin basic protein; and IgG index in patients with multiple sclerosis (MS, n = 64), neuromyelitis optica spectrum disorder (NMOSD, n = 35), tumefactive demyelinating lesion (TDL, n = 17), CNS lymphoma ( n = 12), or glioma ( n = 10). We detected diagnostic markers using logistic regression and receiver operating characteristic (ROC) analyses.Median CSF IL-10 and sIL-2R levels were higher in CNS lymphoma patients than in MS, NMOSD, or TDL patients. Logistic regression revealed that CSF sIL-2R levels predicted CNS lymphoma. In the ROC analysis of CSF sIL-2R levels, the area under the curve was 0.867, and the sensitivity and specificity were 83.3% and 90.0%, respectively.CSF sIL-2R levels can be used to differentiate CNS lymphoma from CNS IDDs. Further studies may identify other applications of CSF as a diagnostic biomarker.