CSF: cerebrospinal fluid; EVD: external ventricular drain; F: female; LETM: longitudinally extensive transverse myelitis; M: male; MOGAD: myelin oligodendrocyte glycoprotein antibody-associated disease; MS: multiple sclerosis; N/A: not available; NMOSD: neuromyelitis optica spectrum disorder; OCB: oligoclonal band; PE: plasma exchange; VP shunt: ventriculoperitoneal shunt. This evidence concerns the gene MOG and myeloid sarcoma.