title: Letter: Methotrexate in cerebrospinal fluid.
mesh_terms: D002556:Cerebrospinal Fluid Proteins / Q000032:analysis*; D006801:Humans; D008727:Methotrexate / Q000008:administration & dosage / Q000134:cerebrospinal fluid*
chemical_list: D002556:Cerebrospinal Fluid Proteins; D008727:Methotrexate