ABSTRACT
Whether neuromyelitis optica (NMO), the co-occurrence of myelitis and optic neuritis,
is a variant of multiple sclerosis (MS) or a unique disease is controversial. Distinct
neuropathological features and a fulminant clinical course argue in favor of NMO as
a distinct disease. However, the combination of neurological impairments of myelitis
and optic neuritis occurs in patients with several inflammatory disorders, including
multiple sclerosis and collagen vascular diseases. NMO is also associated with certain
infectious diseases. The fact that the NMO phenotype occurs in a variety of disease
states suggests that NMO does not represent a specific clinical entity. To better
understand NMO and its associations with recognized diseases, a systematic review
of the literature using MEDLINE was conducted. The history of NMO, its nosology, associations
with other diseases, and current concepts of its pathogenesis and treatment is reviewed
in this article.
KEYWORDS
Neuromyelitis optica - optic neuritis - myelitis - multiple sclerosis - Devic's disease