Disease patterns · Advanced

Motor neuron disease and its mimics

Motor neuron disease & mimics

Integrate lower motor neuron evidence with progression and upper motor neuron signs.

3 learning sectionsCompiled 2026-09-08English edition · Traditional Chinese available

01The role of EDX

  • Active denervation and chronic neurogenic changes across regions may provide lower motor neuron evidence.
  • Sensory responses are often relatively preserved, but age and coexisting conditions must be considered.

02Diagnostic framework

  • The Gold Coast framework combines progressive motor impairment, upper/lower motor neuron evidence and exclusion of alternatives.
  • One fasciculating muscle or one abnormal EMG does not independently establish ALS.

03Important mimics

  • Consider multifocal motor neuropathy, cervical cord or multiroot disease, myopathy and other explanatory disorders.
  • Block outside compression sites or prominent sensory abnormalities should prompt review of the localization and differential.

Pause and explain

Explain in your own words: “ALS remains a clinical diagnosis; EMG is not a stand-alone ALS test.” Then think of a situation in which it could be misinterpreted.

Show a review prompt

Benign fasciculations exist. A waveform name is not a disease diagnosis.

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References and further reading

Educational synthesis; independent neuromuscular specialist review is pending. Publication dates and compilation dates are distinct. This is an original teaching synthesis; consult the source for complete methods and criteria.