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Updated: Jun 12, 2026

Posterior Approach for Debridement of the Psoas Abscess
Published on: March 2, 2020
Septicemia of unknown origin causing by Streptococcus agalactiae primary psoas abscess: a case report
1Department of Surgery, Srisangworn Sukhothai Hospital, Sukhothai, Thailand. somchaimeesiri@yahoo.com
Abstract:
Staphylococcus aureus is the commonest organism resulting in primary psoas abscesses. However non-staphylococcal primary psoas abscesses have increasingly been published in the literature. Here, the author reports a case of primary psoas abscess in a type II diabetic woman previously diagnosed Streptococcus agalactiae septicemia of unknown origin, which rapidly responded to penicillin plus clindamycin and prompt surgical drainage. Diabetic patients are not only susceptible to soft tissue infection but also primary psoas abscess caused by Streptococcus agalactiae.
Insights
Primary psoas abscesses are usually caused by Staphylococcus aureus. This case highlights a rare Streptococcus agalactiae primary psoas abscess in a diabetic patient, successfully treated with antibiotics and drainage.
Area of Science:
- Infectious Diseases
- Microbiology
- Clinical Medicine
Background:
- Primary psoas abscesses are most commonly caused by Staphylococcus aureus.
- Non-staphylococcal causes are increasingly reported, necessitating broader etiological consideration.
- Diabetic patients exhibit increased susceptibility to infections, including soft tissue and deep-seated abscesses.
Observation:
- A case of primary psoas abscess in a type II diabetic woman is presented.
- The patient had a prior history of Streptococcus agalactiae septicemia of unknown origin.
- The abscess was successfully treated with a combination of penicillin and clindamycin, alongside prompt surgical drainage.
Findings:
- Streptococcus agalactiae can be an etiological agent of primary psoas abscess.
- Prompt antibiotic therapy and surgical intervention are effective in managing such cases.
- Diabetic individuals are at higher risk for primary psoas abscesses caused by Streptococcus agalactiae.
Implications:
- This case expands the known spectrum of pathogens causing primary psoas abscesses.
- It underscores the importance of considering Streptococcus agalactiae in diabetic patients with psoas abscesses.
- Early diagnosis and appropriate treatment are crucial for favorable outcomes in complex infectious cases.
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