Abstract
Background: Idiopathic longitudinally extensive transverse myelitis is defined as a focal spinal cord lesion that involves three or more segments of the spinal cord as shown by neuroimaging, and results in a profound disability. The clinical picture of a patient with idiopathic longitudinally advanced transverse myelitis is often dramatic and may consist of paraparesis or tetraparesis, sensory disturbances, and pelvic dysfunction. Idiopathic longitudinally advanced transverse myelitis is a common manifestation of the neuromyelitis optica spectrum disorders, but can also occur in various other autoimmune and inflammatory diseases of the CNS, such as multiple sclerosis, sarcoidosis, or Sjogrens syndrome, or in infectious diseases involving the CNS. It is less likely to occur in isolation, as the only manifestation of a demyelinating disease of the nervous system of an unknown etiology (idiopathic myelitis). Clinical case description: The clinical observation presented in the article demonstrates the difficulties of establishing a nosological diagnosis in the case of a monophasic course of TM in the absence of other autoimmune and infectious diseases of the central nervous system. The patient with idiopathic longitudinally distributed TM had no visual disturbances and no antibodies to aquaporin 4 and to myelin oligodendrocyte glycoprotein (MOG-IgG) with twice repeated tests. Conclusion: In this regard, it is important to dynamically monitor the clinical manifestations and MRI signs in patients with an isolated lesion of a demyelinating nature in the form of longitudinally extensive transverse myelitis.