BDNF and neurosarcoidosis: In a subgroup analysis comparing BDNF concentrations only in IND with an acute inflammatory relapse (e.g., pwMS, MOGAD, NMOSD, neurosarcoidosis, etc.), sBDNF was still significantly higher (p = 0.03, Fig. 4), while neurological patients without acute relapse did not differ regarding their sBDNF levels compared to somatoform controls (p = 0.4, Fig. 4).