Myasthenia gravis masquerading as post-poliomyelitis syndrome

Area of Science:

• Neurology
• Infectious Diseases

Background:

• Poliomyelitis is a debilitating infectious disease with potential long-term neurological sequelae.
• Post-polio syndrome (PPS) is characterized by new-onset neuromuscular symptoms years after the initial poliovirus infection.

Observation:

• A 79-year-old male with a history of bulbar poliomyelitis presented with progressive dysphagia.
• The patient was initially diagnosed with post-polio syndrome, experiencing worsening swallowing difficulties and aspiration pneumonia over two years.
• New symptoms of fatigue and facial weakness led to a subsequent diagnosis of myasthenia gravis.

Findings:

• The diagnostic criteria for post-polio syndrome necessitate the exclusion of other neurological disorders.
• Myasthenia gravis, a distinct neuromuscular condition, shares some overlapping symptoms with PPS, such as muscle weakness and fatigue.
• This case highlights the importance of differential diagnosis in complex neurological presentations.

Implications:

• Clinicians should maintain a high index of suspicion for alternative diagnoses when patients with established conditions like PPS develop new or worsening symptoms.
• Accurate and timely diagnosis is critical for effective management and to prevent complications such as aspiration pneumonia.
• This case underscores the need for ongoing reassessment of diagnoses in patients presenting with evolving neurological deficits.