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Related Concept Videos

Parkinson's Disease: Overview01:15

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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
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Related Experiment Video

Updated: Dec 25, 2025

Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis
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Primary lateral sclerosis: diagnosis and management.

Martin R Turner1, Kevin Talbot2

  • 1Nuffield Department of Clinical Neurosciences, Oxford University, Oxford, UK martin.turner@ndcn.ox.ac.uk.

Practical Neurology
|March 29, 2020
PubMed
Summary

Primary lateral sclerosis (PLS) is a rare upper motor neuron disease. Diagnosis requires excluding lower motor neuron signs, and multidisciplinary care is recommended for this condition.

Keywords:
alsmotor neuron diseasemyelopathy

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Area of Science:

  • Neurology
  • Neurodegenerative Disorders

Background:

  • Primary lateral sclerosis (PLS) is a rare motor neuron disease affecting upper motor neurons.
  • Diagnosis is clinical, characterized by progressive spasticity, often starting in the lower limbs or with spastic dysarthria.
  • Distinguishing PLS from upper motor neuron-predominant amyotrophic lateral sclerosis can be challenging initially due to overlapping symptoms.

Purpose of the Study:

  • To describe the clinical characteristics and diagnostic criteria of Primary Lateral Sclerosis.
  • To highlight the management and prognosis of PLS.
  • To emphasize the need for research and therapeutic trials for PLS.

Main Methods:

  • Clinical diagnosis based on characteristic symptoms and exclusion of lower motor neuron involvement.
  • Observation of disease progression, including spasticity, dysarthria, and potential cognitive changes.
  • Review of management strategies and prognostic factors.

Main Results:

  • PLS presents typically around age 50 with slowly progressive spasticity and upper motor neuron signs.
  • Absence of lower motor neuron involvement is key, though early differentiation from ALS can be difficult.
  • Cognitive dysfunction may occur, but dementia is not usually prominent; PLS is not necessarily life-shortening.

Conclusions:

  • Specialized multidisciplinary care is recommended for patients with Primary Lateral Sclerosis.
  • International research collaboration is crucial for advancing therapeutic trials for PLS.
  • While challenging to diagnose early, PLS has a distinct clinical course and prognosis.