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Area of Science:

  • Pediatric Orthopedics
  • Infectious Diseases
  • Radiology

Background:

  • Brodie's abscess is a subacute osteomyelitis typically affecting long bones in children, often presenting with limb pain and no systemic infection signs.
  • This case highlights a rare instance of Brodie's abscess secondary to Group A Streptococcus (GAS) pharyngitis, a previously unreported association.
  • Standard diagnostic approaches for pediatric limb pain may miss Brodie's abscess, necessitating a broader differential diagnosis.

Purpose of the Study:

  • To report a unique case of Brodie's abscess in a child resulting from Group A Streptococcus (GAS) pharyngitis.
  • To emphasize the importance of considering Brodie's abscess in the differential diagnosis of pediatric limb pain, particularly following streptococcal infections.
  • To underscore the role of advanced imaging, such as MRI, in diagnosing subacute osteomyelitis in children.

Main Methods:

  • Case report of a 6-year-old boy presenting with symptoms consistent with septic arthritis.
  • Diagnostic workup included physical examination, laboratory tests, and Magnetic Resonance Imaging (MRI) of the affected limb.
  • Cultures of wound aspirate were obtained for microbiological analysis to identify the causative pathogen.

Main Results:

  • Initial presentation mimicked septic arthritis, but MRI revealed Brodie's abscess in the distal femur.
  • Cultures confirmed Streptococcus pyogenes (Group A Streptococcus) as the causative agent.
  • The patient experienced a recurrence of the abscess after initial treatment, requiring further medical and surgical intervention.

Conclusions:

  • Group A Streptococcus pharyngitis can be a precursor to Brodie's abscess, necessitating thorough patient history and high clinical suspicion.
  • In children presenting with atraumatic limb pain and negative initial workups for septic arthritis, MRI is essential to rule out Brodie's abscess.
  • Increased incidence of invasive streptococcal strains warrants vigilance for atypical presentations and complications, including osteomyelitis.