Histological patterns in drug-induced liver disease

Area of Science:

• Hepatology
• Toxicology
• Internal Medicine

Background:

• Drug-induced liver injury (DILI) diagnosis is challenging due to incomplete data and varied presentations.
• Histological patterns of DILI on biopsy can mimic primary liver diseases, complicating diagnosis.
• Accurate identification of DILI is essential for patient management and preventing severe liver damage.

Purpose of the Study:

• To review the diagnostic challenges and diverse histological manifestations of drug-induced liver injury (DILI).
• To highlight common and uncommon patterns of DILI, including acute hepatitis, chronic liver disease, and steatohepatitis.
• To emphasize the importance of considering drug exposure in patients presenting with liver abnormalities.

Main Methods:

• Review of literature on drug-induced liver injury (DILI) diagnosis and histological patterns.
• Analysis of clinical information and biopsy findings in DILI cases.
• Categorization of DILI based on histological presentation and causative agents.

Main Results:

• Acute hepatitis is the most common histological pattern of DILI, with acetaminophen being a leading cause of acute liver failure.
• DILI can present with diverse patterns including chronic hepatitis, autoimmune hepatitis, prolonged cholestasis, steatohepatitis, granulomatous hepatitis, and vascular injury.
• While most DILI cases resolve upon drug withdrawal, some may progress or lead to chronic liver disease.

Conclusions:

• Drug-induced liver injury (DILI) presents a diagnostic challenge due to its varied clinical and histological features.
• Recognizing the broad spectrum of DILI manifestations is critical for timely diagnosis and appropriate management.
• Comprehensive patient history, including exposure to medications, herbal products, and toxins, is vital for diagnosing DILI.