| RA | Rheumatoid arthritis |
| TNF-α | tumor necrosis factor-alpha |
| BUN | Blood Urea Nitrogen |
| CNS | Central Nervous System |
| CRP | C-Reactive Protein |
| CSF | Cerebrospinal Fluid |
| DWI | Diffusion-Weighted Imaging |
| DMARDs | Disease-Modifying Antirheumatic Drugs |
| FLAIR | Fluid-Attenuated Inversion Recovery |
| IL-6 | Interleukin-6 |
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