AJNR. American journal of neuroradiology
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AJNR Am J Neuroradiol · Jun 1998
Cerebral N-acetylaspartate is low in patients with multiple sclerosis and abnormal visual evoked potentials.
Our purpose was to compare cerebral proton MR metabolite changes in patients with multiple sclerosis (MS) and abnormal visual evoked potentials (VEPs) with those in MS patients with normal VEPs. ⋯ In patients with MS, NAA measurements in the optic pathways of the brain were sensitive to VEP abnormalities. NAA was more sensitive to VEP changes than were choline, creatine, MR-detectable lesions, and EDSS score.
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AJNR Am J Neuroradiol · Jun 1998
Comparative StudyActivation of the sensorimotor cortex at 1.0 T: comparison of echo-planar and gradient-echo imaging.
The increasing demand for the clinical application of functional MR imaging raises the question of whether this technique can be routinely performed on 1.0-T MR scanners. To this end, we assessed the feasibility of functional MR imaging at 1.0 T. ⋯ Functional MR imaging of the sensorimotor cortex can be routinely performed at 1.0 T.
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We describe a case of myeloneuropathy resulting from nitrous oxide abuse. MR imaging of the spine revealed symmetric abnormal signal in the posterior columns of the cervical cord. Myeloneuropathy is caused by inactivation of vitamin B12 by nitrous oxide. This syndrome can also be seen in patients with borderline vitamin B12 deficiency who have recently been anesthetized with nitrous oxide.