Objective: To determine whether idiopathic recurrent transverse myelitis (RTM) can be distinguished from multiple sclerosis-associated RTM (MSRTM) on the basis of clinical manifestations of myelopathy, or findings from magentic resonance imaging or cerebrospinal fluid examination.Design: A retrospective analysis of 37 cases was conducted. Patients were classified as having idiopathic RTM on the basis of recurrent myelitis confirmed by clinical manifestations of myelopathy and magnetic resonance imaging findings. On review patients with idiopathic RTM had normal cranial magnetic resonance imagings and did not demonstrate paraclinical evidence of spatial dissemination beyond the spinal cord of the disease process. Patients were classified as having MSRTM on the basis of criteria of Poser et al for clinically definite multiple sclerosis involving the central nervous system. Fifteen patients met study criteria for idiopathic RTM. Twenty-two patients had MSRTM. Result: Idiopathic RTM occurred preponderantly in male patients and presented more often with acute transverse myelitis than did MSRTM. More than 2 relapses occurred in 6 cases (40%) of idiopathic RTM. The involved segments of spinal cord on T2-weighted images were not significantly different in idiopathic RTM and MSRTM, with enhancing lesions mostly in the posterior columns, and the spinothalamic and spinocerebellar tracts of white matter. Additionally, almost all patients with idiopathic RTM had normal cerebrospinal fluid indexes.
Conclusion:Idiopathic RTM might be a disease entity distinct from MSRTM, differing in its male preponderance, absence of oligoclonal bands, frequent multiple relapses, and frequent presentation as acute transverse myelitis.Arch Neurol. 2003;60:1290-1294 R ECURRENT TRANSVERSE myelitis (RTM) usually heralds or is accompanied by lesions producing dysfunction elsewhere in the central nervous system and almost always signifies the presence of multiple sclerosis (MS).1-4 A series of 3 cases of RTM in patients who never developed other evidence of MS or collagen vascular disease and had no abnormalities on magnetic resonance imagings (MRIs) of the brain suggested that RTM may be a disorder distinct from MS.5 Recurrent transverse myelitis as an independent entity, with neither abnormal cranial MRI nor oligoclonal bands (OCBs) in cerebrospinal fluid (CSF), is an interesting topic in terms of the causative factors and therapeutic considerations. Further studies in which the criteria for an idiopathic RTM of unknown origin are clearly defined and that include longterm follow-up are needed to distinguish idiopathic RTM from MS-associated RTM (MSRTM). In this study, the medical records of 15 patients with idiopathic RTM who were followed up for longer than 5 years after their first attack of myelitis were reviewed for clinical manifestations, specific spinal MRI findings, and CSF study results to verify a novel disease entity distinguished from clinically definite myelopathic MS.
METHODSThe medical records of 15 consecutive patients (12 men and ...