Granulomatous hepatitis: MRI findings.

Area of Science:

• Radiology
• Hepatology
• Medical Imaging

Background:

• Granulomatous hepatitis is an inflammatory liver condition.
• Accurate diagnosis is crucial for effective management.
• Magnetic resonance imaging (MRI) offers detailed visualization of liver parenchyma.

Purpose of the Study:

• To characterize the MRI findings of granulomatous hepatitis.
• To correlate imaging features with histopathological diagnoses.
• To assess the utility of MRI in differentiating granulomatous hepatitis from other liver pathologies.

Main Methods:

• Retrospective analysis of MRI scans from eight patients with confirmed granulomatous hepatitis.
• Standard MRI sequences including T1-weighted, T2-weighted (STIR), and post-gadolinium contrast-enhanced images (arterial, intermediate, late phases).
• Evaluation of liver nodularity, signal characteristics of granulomas, enhancement patterns, lymphadenopathy, and splenomegaly.

Main Results:

• Diffuse nodular liver involvement (0.5-4.5 cm nodules) observed in all patients.
• Caseating granulomas: intermediate/high T2 signal, low T1 signal, variable enhancement.
• Noncaseating granulomas: intermediate T1/T2 signal, avid arterial enhancement with late phase persistence.
• Splenomegaly and portal lymphadenopathy noted in five patients each.

Conclusions:

• Granulomatous hepatitis exhibits a spectrum of MRI features.
• MRI findings, particularly enhancement patterns, can help distinguish between caseating and noncaseating granulomas.
• MRI is a valuable tool in the differential diagnosis of diffuse nodular liver diseases.