9. Upper motor neuron dysfunction and neuropsychological profile in PLS: Another entrant on the ALS-FTD spectrum

Primary lateral sclerosis (PLS), a rare upper motor neuron disorder, remains a debated entity as an upper motor neuron extreme form of amyotrophic lateral sclerosis (ALS) or a distinct disease. It is now well established that ALS and frontotemporal dementia (FTD) lie on two ends of the frontal neurodegenerative spectrum. While early descriptions of PLS excluded cognitive dysfunction, there is accumulating evidence of varying degrees of frontal lobe deficits accompanying structural and functional changes in the brain in PLS.

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