Granulomatous hepatitis in Q fever

Area of Science:

• Hepatology
• Pathology
• Infectious Diseases

Background:

• Q fever is a zoonotic infection caused by Coxiella burnetii.
• Liver involvement is common in Q fever but histological patterns can vary.
• Accurate diagnosis relies on serological tests and characteristic pathological findings.

Purpose of the Study:

• To describe the histological features of liver lesions in patients with Q fever.
• To identify distinctive pathological patterns associated with Q fever in the liver.
• To assess the diagnostic utility of liver biopsy findings in Q fever.

Main Methods:

• Histopathological examination of liver biopsies from 17 patients with serologically confirmed Q fever.
• Detailed analysis of granuloma formation and presence of fibrinoid material.
• Review of serial sections to identify specific patterns.

Main Results:

• A distinctive granulomatous pattern with a fibrinoid ring was observed in 14 out of 17 patients.
• Fibrinoid material appeared as fibrillar eosinophilic structures in two cases.
• Only one case showed non-specific granulomas without fibrinoid material.

Conclusions:

• The presence of granulomas with fibrinoid material in liver biopsies is highly suggestive of Q fever.
• Histological examination, including serial sections, is crucial for identifying this characteristic pattern.
• This finding can aid in the diagnosis of Q fever, especially when serological results are equivocal.