Overlapping rheumatoid meningitis with anti-N-methyl-D-aspartate receptor encephalitis: A case report.

A 66-year-old woman in treatment for rheumatoid meningitis was found to be positive for anti-N-methyl-D-aspartate receptor (NMDAR) antibodies in the cerebrospinal fluid, and intravenous immunoglobulin improved her psychiatric symptoms. The co-existence of NMDAR antibodies should be considered in cases of poor response to treatments or atypical symptoms in rheumatoid meningitis.