Lu, J., Zhang, J., Miao, A. et al. Brain astrocytoma misdiagnosed as anti-NMDAR encephalitis: a case report. BMC Neurol 19, 210 (2019). https://doi.org/10.1186/s12883-019-1436-x
....
Conclusions
Although the sensitivity and specificity of anti-NMDAR-IgG antibodies in CSF to diagnose anti-NMDAR encephalitis are close to 100%, it is not absolute. Anti-NMDAR antibodies were positive, which might make the diagnosis more complex. The diagnosis of atypical presentation of anti-NMDAR encephalitis requires reasonable exclusion of other disorders.
....
....
Conclusions
Although the sensitivity and specificity of anti-NMDAR-IgG antibodies in CSF to diagnose anti-NMDAR encephalitis are close to 100%, it is not absolute. Anti-NMDAR antibodies were positive, which might make the diagnosis more complex. The diagnosis of atypical presentation of anti-NMDAR encephalitis requires reasonable exclusion of other disorders.
....