Overview
Idiopathic granulomatous hepatitis (IGH) is a rare, chronic inflammatory liver disease characterized by the formation of granulomas in the liver. The etiology of IGH is unknown, but it is thought to be immune-mediated. It can lead to progressive liver damage and fibrosis if left untreated.Diagnosis
Diagnosis is typically made by liver biopsy showing non-caseating granulomas in the absence of a known cause 1.
Exclusion of other causes of granulomatous liver disease, such as infections (tuberculosis, fungal), sarcoidosis, and drug-induced liver injury, is crucial 1.
Laboratory tests may show elevated liver enzymes, but these are often nonspecific.Management
Corticosteroids are the mainstay of treatment for symptomatic or progressive IGH 1.
Immunosuppressive agents such as azathioprine or methotrexate may be used as steroid-sparing agents or in refractory cases 1.
The cGAS-STING pathway has emerged as a central regulator in liver pathology, implicated in inflammation and fibrosis, and may represent a future therapeutic target 1.Key Recommendations
Corticosteroids are the first-line treatment for idiopathic granulomatous hepatitis 1. (Evidence: Moderate)
Consider immunosuppressive agents for steroid-sparing or refractory disease 1. (Evidence: Weak)
The cGAS-STING pathway is a potential therapeutic target due to its role in liver inflammation and fibrosis 1. (Evidence: Weak)References
1 Fan Y, Dong Z, Wu Y, Wen H. Molecular mechanisms and therapeutic strategies of cGAS-STING pathway in liver disease: the quest continues. Frontiers in immunology 2025. link