Two patients tested positive for autoimmune encephalitis antibodies, with one patient having concomitant anti-CASPR2 antibody positivity in both the serum and CSF (titer of 1:10 in both serum and CSF) and the other patient having anti-LGI1 antibody positivity in both the serum (titer of 1:30) and CSF (titer of 1:10). Here, CNTNAP2 is linked to autoimmune encephalitis.