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Pyomyositis of the thigh due to Prevotella melaninogenica
1Dept. of Internal Medicine B, Bnai Zion Medical Center, Haifa, Israel.
Abstract:
Pyomyositis is an uncommon infection in temperate climates, however, it is being more frequently reported among patients with diabetes or malignancy, or those who are immunocompromised. It is predominantly caused by Staphylococcus aureus, and rarely by Bacteroides species. Pyomyositis due to Prevotella melaninogenica has not previously been reported. We describe an elderly patient with pyomyositis of the thigh due to P. melaninogenica which was successfully treated by surgical incision and drainage in combination with metronidazole therapy.
Insights
Pyomyositis, a rare muscle infection, is increasingly seen in immunocompromised individuals. This report details a thigh infection caused by Prevotella melaninogenica, successfully treated with surgery and antibiotics.
Area of Science:
- Infectious Diseases
- Microbiology
- Surgical Pathology
Background:
- Pyomyositis is a bacterial muscle infection, uncommon in temperate regions but rising in immunocompromised populations, including those with diabetes or malignancy.
- Staphylococcus aureus is the most common pathogen, with Bacteroides species rarely implicated.
- Prevotella melaninogenica has not been previously documented as a cause of pyomyositis.
Observation:
- An elderly patient presented with pyomyositis affecting the thigh.
- The causative agent identified was Prevotella melaninogenica.
- The infection was localized to the thigh musculature.
Findings:
- Successful treatment of pyomyositis caused by Prevotella melaninogenica was achieved.
- Treatment involved a combination of surgical incision and drainage.
- Metronidazole therapy was administered concurrently with surgical intervention.
Implications:
- This case expands the known spectrum of pathogens causing pyomyositis.
- Highlights the importance of considering unusual bacteria in pyomyositis, especially in at-risk patients.
- Demonstrates the efficacy of surgical management and targeted antibiotic therapy (metronidazole) for Prevotella-induced pyomyositis.