NEFL and Behcet disease: In case of BD, NfL CSF levels have been found significantly elevated in euthymic BD patients and positively associated with the use of atypical antipsychotic treatment (8), whereas a longitudinal study made by the same research group yielded that higher CSF NfL levels have no significant association with a poor clinical outcome in BD patients after a 6-7 years follow-up (9).