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Pyomyositis in Children: A 15-year Retrospective Study From a Tertiary Care Pediatric Hospital in Portugal

Vitória Cadete1, Susana Norte2, Joana Arcângelo2

  • 1From the Pediatric Department.

The Pediatric Infectious Disease Journal
|May 29, 2025
PubMed

Insights

Pyomyositis, a muscle infection, often presents with nonspecific symptoms. This study found that many children with pyomyositis, even in the suppurative phase, can recover with conservative antibiotic treatment, avoiding surgical drainage.

Area of Science:

  • Pediatric Infectious Diseases
  • Musculoskeletal Infections
  • Clinical Microbiology

Background:

  • Pyomyositis is a primary skeletal muscle infection, predominantly seen in children in tropical regions.
  • Current treatment paradigms often involve antibiotics and surgical drainage, though this remains a subject of debate.

Purpose of the Study:

  • To analyze predisposing factors, clinical presentation, diagnostic findings, treatment strategies, and outcomes of pediatric pyomyositis.
  • To evaluate the efficacy of conservative management versus surgical intervention in pyomyositis cases.

Main Methods:

  • A retrospective, single-center study was conducted over 15 years (2008-2022) at a pediatric tertiary care hospital.
  • Data collected included patient demographics, predisposing factors, clinical signs, laboratory results, imaging, treatment details, and follow-up assessments.

Main Results:

  • Twenty-nine pediatric patients were included, with intense physical activity and trauma as common triggers.
  • Methicillin-sensitive Staphylococcus aureus was the most frequent pathogen. Conservative treatment with intravenous antibiotics was successful in most cases, with drainage reserved for a minority.
  • Magnetic resonance imaging demonstrated high sensitivity (100%) for diagnosis, while ultrasound results were inconclusive in over 40% of cases.

Conclusions:

  • Pediatric pyomyositis can manifest with nonspecific symptoms, necessitating a high index of suspicion.
  • Conservative management, including antibiotics without drainage, is a viable option for many pyomyositis cases, including those in the suppurative stage.
  • Methicillin-sensitive Staphylococcus aureus is the predominant causative agent, guiding antibiotic selection.
Abstract

Keywords:
osteoarticular infectionprimary pyomyositispurulent infectious myositispyomyositis

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