Primary lateral sclerosis is a variant of amyotrophic lateral sclerosis with progressive affection of the pyramidal tracts. Bulbar symptoms are also common.
Sites 2
- 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).