Perineal Crohn's disease complicated by pyogenic liver abscess during metronidazole therapy

Area of Science:

• Microbiology
• Gastroenterology
• Infectious Diseases

Background:

• Crohn's disease is a chronic inflammatory condition affecting the gastrointestinal tract.
• Pyogenic liver abscesses are serious infections requiring prompt diagnosis and treatment.
• Streptococcus milleri is frequently implicated in pyogenic liver abscesses.

Observation:

• A patient with ileal and perineal Crohn's disease developed a Streptococcus milleri liver abscess.
• The patient had received high-dose metronidazole for a perineal abscess.
• Cultures of the perineal abscess revealed Streptococcus milleri, initially misidentified.

Findings:

• This case underscores the challenges in accurately identifying Streptococcus milleri.
• Metronidazole therapy may lead to the overgrowth of Streptococcus milleri in perineal Crohn's disease.
• This overgrowth could predispose patients to secondary infections like liver abscesses.

Implications:

• Clinicians should consider the potential for Streptococcus milleri overgrowth with metronidazole use in perineal Crohn's disease.
• Accurate identification of Streptococcus milleri is crucial for effective treatment.
• Understanding the impact of antibiotics on local bacterial ecology is important in managing complex cases.