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Updated: May 26, 2026

Posterior Approach for Debridement of the Psoas Abscess
Published on: March 2, 2020
Psoas abscess due to Pasteurella multocida
A Ruiz de la Hermosa1, I Amunategui-Prats, E Hurtado-Caballero
1Cirugía General y del Aparato Digestivo, Cirugía General I. Hospital General Universitario Gregorio Marañón, Madrid, Spain. aliciaruiz9@hotmail.com
Abstract:
Psoas abscess is a pus collection within the muscle compartment. It is a very uncommon entity. It can be primary as a result of haematogenous spread or secondary as a consequence of a direct extension of an infectious focus. Diagnosis is usually delayed because nonspecific clinical presentation. Staphylococcus aureus is the most common organism cultured in this type of abscess. We describe a secondary psoas abscess in an elderly female patient. The patient presented with fever, right groin pain and malaise. Following laboratory, radiological and microbiological analyses the patient was diagnosed as having a psoas abscess due to Pasteurella multocida, which is a Gram negative bacteria, part of the normal oral flora of many animals and can causes human infections after animal scratches or bites. More rarely is to find this organism causing psoas abscesses. Because of insidious clinical presentation, the diagnosis of psoas abscess is a challenge and a high index of suspicion is required. We emphasize the importance of bacteriological confirmation of microorganism involved to choose the correct antibiotics. Percutaneous drainage is the treatment of choice. Open surgical drainage should be reserved if percutaneous drainage fails.
Insights
Psoas abscess, a rare pus collection, can be challenging to diagnose due to vague symptoms. This case highlights a secondary psoas abscess caused by Pasteurella multocida, emphasizing the need for accurate identification and treatment.
Area of Science:
- Infectious Diseases
- Medical Microbiology
Background:
- Psoas abscess is an uncommon intra-muscular pus collection, often diagnosed late due to non-specific symptoms.
- Staphylococcus aureus is the most frequent pathogen, but other organisms can be involved.
Observation:
- A case of secondary psoas abscess in an elderly female presenting with fever, right groin pain, and malaise is described.
- Diagnostic workup included laboratory, radiological, and microbiological analyses.
Findings:
- The patient was diagnosed with a psoas abscess caused by Pasteurella multocida, a Gram-negative bacterium.
- Pasteurella multocida, typically found in animal oral flora, rarely causes psoas abscesses.
Implications:
- The insidious presentation of psoas abscess necessitates a high index of suspicion for timely diagnosis.
- Bacteriological confirmation is crucial for selecting appropriate antibiotic therapy, with percutaneous drainage as the preferred treatment.
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