Primary lateral sclerosis (PLS) may be distinguished on the basis of clinical and pathological features from amyotrophic lateral sclerosis (ALS). The former is featured by a much longer clinical course, exclusively upper motor neuron findings, losses of precentral pyramidal neurons, and preservation of anterior horn cells. Electrophysiological studies of 7 PLS cases have shown normal peripheral motor conduction, absent or very delayed motor-evoked potentials, the occasional late development o...Expand abstract
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Motor-evoked responses in primary lateral sclerosis.
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