Acute transverse myelitis (ATM) is a clinical syndrome in which damage to the cord is thought to occur via an immune mediated process without any evidence of cord compression. It can occur at any age and affects both genders to the same extent.
ATM may occur only once or may appear in a relapsing, recurrent form. When it occurs as an isolated event without an apparent reason it is called idiopathic ATM. It may, however, occur within the context of a systemic disease (lupus, Sjogren's syndrome, antiphospholipid syndrome) in which multiple body systems are affected, following an
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