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Common MR findings of idiopathic transverse myelitis included a centrally located hyperintensity occupying more than two thirds of the cross- sectional area of the cord(88%);a length of 3 to 4 vertebral segments (53%),with variable presence of cord expansion(47%);a small central area of intensity,isointense with normal cord,in the core of hyperintensity (47%);focal,peripheral cord enhancement(53%),particularly in patients with cord expansion;and a slow regression of T2 hyperintensity with an enhancing nodule.although no linear correspondence was observed between MR findings and neurologic signs and symptoms,all but 4 patients improved clinically as MR findings improved or remained stable.MR findings are helpful in detecting transverse myelitis and in differentiating this entity from multiple sclerosis and cord tumors,but clinical assessment and observation of MR changes over time are essential in making the diagnosis. |
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