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Utility of Dissociated Intrinsic Hand Muscle Atrophy in the Diagnosis of Amyotrophic Lateral Sclerosis

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Pure primary lateral sclerosis--Case reports.

Barbara Tomik¹, Kamila Anna Zur, Andrzej Szczudlik

¹Department of Neurology, Jagiellonian University Medical College, 3 Botaniczna Street, Krakow, Poland. tomik@neuro.cm-uj.krakow.pl

Clinical Neurology and Neurosurgery

|February 12, 2008

Summary

Primary Lateral Sclerosis (PLS) may be a distinct condition, not part of motor neuron disease (MND). Four PLS patients showed only upper motor neuron signs and slow progression over 11.5 years, maintaining independence.

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Area of Science:

Neurology
Neuroscience
Clinical Medicine

Background:

The classification of Primary Lateral Sclerosis (PLS) remains debated, with uncertainty regarding its distinct pathological entity versus its position within the motor neuron disease (MND) spectrum.
Distinguishing pure PLS from other MND forms is crucial for accurate diagnosis and prognosis.

Purpose of the Study:

To present a series of four patients diagnosed with Primary Lateral Sclerosis (PLS).
To analyze the clinical progression and characteristics of these PLS patients over an extended observation period.
To contribute evidence to the debate on whether PLS is a distinct entity or part of the MND spectrum.

Main Methods:

Prospective observational study of four PLS patients.
Data collection from symptom onset (1990-1999) through January 2007.
Clinical assessment focusing on upper motor neuron (UMN) and lower motor neuron (LMN) signs, disease duration, and functional independence.

Main Results:

All four patients exhibited only upper motor neuron (UMN) signs, characterized by spasticity, hyperreflexia, clonus, and Babinski signs.
Three patients presented with spastic paraparesis, and one with spastic dysarthria at onset.
Mean disease duration was 11.5 years, with no development of lower motor neuron (LMN) signs during observation.
Patients maintained a high level of independence throughout the study period.

Conclusions:

The findings support the hypothesis that pure Primary Lateral Sclerosis (PLS) represents a distinct clinical entity.
PLS cases demonstrate a slow disease progression and prolonged course with preserved independence compared to other motor neuron diseases (MND).
Further research is warranted to fully elucidate the pathological basis and diagnostic criteria for distinguishing PLS from MND.