Pyomyositis

Acute intramuscular infection secondary to haematogenous spread of the microorganism into the body of a skeletal muscle, most commonly caused by Staph. aureus

Aetiology

Risk factors

  • PWIDs
  • Diabetes meletus
  • Immunosuppressed

Causative organisms

  • 90% staphlococcal
  • Some site specific e.g. GNB in perineum
  • Immunosuppressed - psudomonas, beta haemolytic strep. enterococcus
  • In tropical climates - MSSA infection in immune competant patients and children
  • Clostridium infection possible in contaminated wounds

Clinical presentation

  • Pain and swelling of the affected area (usually lower extremities)
  • Fever

Investigations

  • Imaging - US, CT, MRI
  • Pus discharge culture and sensitivity

Management

  • Antibiotics and surgery (debridement)