is a bandlike sensation around the trunk that occurs due to myelopathy, and may be a feature of NMO. Optic neuritis and cervical myelopathy are part of the
diagnostic criteria for NMO, meaning that they must be present in order for the diagnosis to be made. Supportive criteria, meaning criteria that further help in establishing the diagnosis, include myelopathy involving a specific length of the spinal cord, an MRI that does NOT meet criteria for MS, and positive NMO-IgG antibodies.