[Pyomyositis in children: Two cases of Staphylococcus aureus infection]

Area of Science:

• Infectious Diseases
• Pediatrics
• Musculoskeletal Disorders

Background:

• Pyomyositis, a primary pyogenic skeletal muscle infection, was historically observed in immunocompromised individuals in tropical regions.
• Recent reports indicate a rise in pyomyositis cases among healthy children in temperate climates, suggesting evolving epidemiology.
• The exact etiology of pyomyositis is uncertain, but transient bacteremia is a suspected cause.

Observation:

• The insidious onset and nonspecific symptoms of pyomyositis pose diagnostic challenges.
• Distinguishing pyomyositis from conditions like osteomyelitis and septic arthritis is critical for appropriate management.
• Magnetic resonance imaging (MRI) is the preferred modality for accurate diagnosis.

Findings:

• This report details two pediatric cases of primary pyomyositis affecting lower limb muscles.
• The patients were an 8-year-old boy and an 11-year-old girl, both previously healthy.
• The cases highlight the occurrence of pyomyositis in a pediatric population in a temperate climate.

Implications:

• Prompt diagnosis of pyomyositis is essential for timely antibiotic selection and preventing severe outcomes.
• Maintaining a broad differential diagnosis is vital due to the nonspecific presentation of pyomyositis.
• Increased awareness and utilization of advanced imaging like MRI can improve pyomyositis detection in children.