Abstract
Immunoglobulin G4-related Disease (IgG4-RD) is an immune-mediated fibroinflammatory disease that affects multiple organs, resulting in tumefactive lesions and/or organ dysfunction. This chronic, multiorgan inflammatory process is characterised by the infiltration of IgG4-positive plasma cells and has a variable clinical presentation depending on the organ involved. The present case series discusses four cases (two males and two females) of IgG4-RD involving different sites in patients presented to present Institution. The authors reviewed four cases of IgG4-RD, including clinical details, biochemical, radiological, and histopathological features. The case series includes IgG4-RD masquerading as meningioma, IgG4-related sclerosing cholangitis, IgG4-RD of the thyroid gland, and IgG4-RD of the lacrimal gland. Since IgG4-RD has non specific clinical features, histopathological analysis and immunohistochemistry play a pivotal role in diagnosis. Despite its diagnostic difficulties, earlier recognition is crucial to prevent significant morbidity and extensive fibrosis leading to organ failure.
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