Keywords: ADA, Adenosine Deaminase; Astrocytopathy; CSF, Cerebrospinal Fluid; GFAP, Glial Fibrillary Acidic Protein; Glial fibrillary acidic protein; MRI, Magnetic Resonance Imaging; Magnetic resonance imaging; Meningitis; anti-GFAPα, anti-Glial Fibrillary Acidic Protein antibody.