Medical Case Studies

  • Abbreviation: Med. Case Stud.
  • Language: English
  • ISSN: 2141-6532
  • DOI: 10.5897/MCS
  • Start Year: 2010
  • Published Articles: 43

Case Report

The great mimicker: A rare case of Iliopsoas abscess associated with vertebral and sacroiliac osteomyelitis

Jeong-moh John YAHNG
  • Jeong-moh John YAHNG
  • Western Health, Victoria, Australia
  • Google Scholar
  • Lei YING
  • Western Health, Victoria, Australia
  • Google Scholar

  •  Received: 12 November 2018
  •  Accepted: 28 January 2019
  •  Published: 28 February 2019


A 21-year-old, recent Indian migrant to Australia, presented to the Emergency Department with a 3-week history of worsening right buttock and thigh pain and weakness, associated with fever of up to 39°C and weight loss of 3 kg. On examination, the patient demonstrated a right-sided antalgic gait with a limp and weakness of right hip flexion. The patient was tachycardic with a heart rate of 140, and had  raised inflammatory markers with white blood cell count of 13.0 × 109/ L and C-reactive protein of 246 mg/L. Subsequent MRI pelvis revealed a 69 mm × 25 mm × 38 mm, right-sided iliopsoas abscess with oedema extending to the right paraspinal muscle at the level of 5th lumbar vertebra, associated with the enhancement of 5th right hemi-lumbar vertebra, the right side of the sacrum and adjacent ilium consistent with osteomyelitis of these bones. CT-guided percutaneous drainage of the iliopsoas abscess was performed, and 30 ml of haemopurulent fluid was aspirated and sent for microbial culture. Abscess cultured methicillin-sensitive Staphylococcus aureus. The patient was treated with 2 weeks of intravenous flucloxacillin, and further 3 weeks of oral flucloxacillin. At follow-up in 3 months, the patient was pain free and inflammatory markers had normalised.

Key words: Abscess, iliopsoas, osteomyelitis, drainage, CT-guided, osteomyelitis, vertebral, osteomyelitis, sacroiliac



IPA, Iliopsoas abscess; CT, Computer tomography; MRI, Magnetic resonance imaging.