Related Experiment Video
Updated: Feb 3, 2026

Mouse Model of Metabolic Dysfunction-Associated Steatotic Liver Disease with Fibrosis
Published on: July 18, 2025
Retroperitoneal Fibrosis Diagnosed as IgG4-related Disease after 35 Years
Satoshi Konno1, Yoshihiro Matsuno2, Shingo Ichimiya3
1First Department of Medicine, Hokkaido University School of Medicine, Japan.
Abstract:
In 1982, we reported a case of retroperitoneal fibrosis (RPF) exhibiting various clinical manifestations. Our current understanding of immunoglobulin G4 (IgG4)-related disease led us to consider it as a possible diagnosis because all of the patient's clinical features could be explained by this disease entity. To confirm our hypothesis, were investigated the histopathological findings of resected specimens that had been stored for 35 years postoperatively. Typical pathological findings together with predominant IgG4+ plasma cell infiltration confirmed a potential diagnosis of IgG4-related RPF. Furthermore, we observed positive immunohistochemical staining for several molecules associated with T regulatory and T follicular helper cells.
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