Primary lateral sclerosis is a variant of amyotrophic lateral sclerosis with progressive affection of the pyramidal tracts. Bulbar symptoms are also common.
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- Primary Lateral Sclerosis PLS information sheet compiled by the National Institute of Neurological Disorders and Stroke (NINDS).
- Primary Lateral Sclerosis - Emidicine.com Includes article about primary lateral sclerosis (PLS).