[Simultaneous presentation of amyotrophic lateral sclerosis and multiple sclerosis]

Area of Science:

• Neurology
• Neuroimmunology

Background:

• Amyotrophic lateral sclerosis (ALS) and multiple sclerosis (MS) are distinct neurological disorders.
• The co-occurrence of ALS and MS is exceptionally rare in clinical practice.

Observation:

• A 55-year-old female presented with progressive gait and speech disorders.
• Initial findings met diagnostic criteria for MS, including MRI and CSF analysis.
• Subsequent development of generalized fasciculations, muscle atrophy, and bulbar signs met ALS criteria.

Findings:

• Nerve conduction studies revealed widespread acute and chronic denervation without conduction block.
• The patient was diagnosed with the unusual concurrent combination of ALS and MS.
• Myelitic lesions in MS can cause peripheral denervation, but the generalized nature suggested co-existing ALS.

Implications:

• This case underscores the importance of considering motor neuron diseases in MS patients exhibiting pronounced peripheral denervation.
• Early recognition of co-existing ALS and MS is crucial for appropriate patient management.
• Highlights the complex differential diagnosis in neurodegenerative and autoimmune conditions.