Eosinophilic cholangitis with eosinophilic granulomatosis with polyangiitis: A case report and review of the literature

Literature review and case study of recurrent EPGA with elevated IgG4 and positive HBsAg successfully treated with rituximab

BACKGROUND

Eosinophilic granulomatosis with polyangiitis (EGPA) is a rare form of autoimmune vasculitis. The involvement of IgG4 and HBsAg in EGPA is less common but can occur and may present unique challenges in management.

CASE PRESENTATION

We present a case study of a 70-year-old female diagnosed with EGPA confirmed via renal biopsy. She initially presented with recurrent purpura, diarrhea and progressive numbness in the hands and feet, accompanied by general weakness. Complete remission was achieved with a one-year course of prednisone acetate and cyclophosphamide treatment. However, upon discontinuation of self-medication, the disease relapsed, manifesting as a generalized rash and weakness in the extremities.Skin biopsy revealed eosinophil infiltration, with inflammatory cells predominantly surrounding blood vessels. Notably, during treatment, the patient's hepatitis B markers transitioned from negative to positive for HBsAg. Subsequent administration of entecavir, along with monitoring for a decrease in HBV DNA levels, preceded the initiation of steroids and rituximab to attain remission once more. Among the remaining 15 patients analyzed, all exhibited elevated serum IgG4 levels, with none testing positive for hepatitis B. Notably, only one patient was diagnosed with immunoglobulin G4-related disease (IgG4-RD), suggesting that elevated IgG4 levels alone may not necessarily indicate IgG4-RD.

CONCLUSIONS

Our case report highlights the first instance of recurrent EGPA accompanied by elevated IgG4 and positivity for hepatitis B, which was successfully treated with rituximab. In cases of concurrent hepatitis B, rituximab treatment may be considered once viral replication is under control. However, emphasis on maintenance therapy is crucial following the induction of disease remission.

Sustained Eosinophilic Cholangitis Due to a Mite Allergy Mimicking Sclerosing Cholangitis

Eosinophilic cholangiopathy (EC) presents with thickening and stenosis of the bile duct wall that is histologically characterized by eosinophil infiltration. The diagnosis is often difficult. We herein report a patient who had been followed up with a diagnosis of primary sclerosing cholangitis but had a final diagnosis of EC based on eosinophilia, histological findings of bile duct and liver biopsy specimens, and a review of a previous surgical specimen of the gallbladder. Antigen tests, isolation from her house, and accidental re-exposure to the antigen revealed that the causative antigen was the mite Dermatophagoides pteronyssinus.

Budd-Chiari syndrome as a complication of eosinophilic granulomatosis with polyangiitis in a young Chinese man: a case report

Hepatic vein thrombosis is a rare occurrence in the clinical course of eosinophilic granulomatosis with polyangiitis (EGPA). The major mechanism of thrombosis has been postulated to involve the release of toxic proteins from eosinophils. A 36-year-old man with EGPA was admitted to our hospital in July 2018 with hematemesis and melena. Findings on physical examination included ascites and pigmentation of the lower extremities. Ultrasonography of the hepatic vein and inferior vena cava showed an obstruction of the hepatic vein. Magnetic resonance imaging showed low enhancement in the right hepatic vein region. At 34 years of age, the patient's EGPA had initially presented as asthma with eosinophilia (white blood cell count of 11.46 × 10¹²/L with 14.6% eosinophils). His skin biopsy showed infiltration of inflammatory cells and eosinophils, especially around medium-sized vessels, which was consistent with EGPA. The patient was thus diagnosed with Budd-Chiari syndrome associated with EGPA.