Orbital inflammatory pseudotumor revealing multi-organ immunoglobulin G4-related disease

Relatively recently, the concept that immunoglobulin G4 (IgG4)-related disease is a distinct chronic inflammatory disorder rather than a subset of Sjögren's syndrome has been accepted. IgG4-related disease (IgG4-RD) is a fibro-inflammatory systemic immune-mediated condition that can affect the pancreas, salivary glands, and lymph nodes. Almost every organ may be impacted synchronously or metachronously by this illness, which causes the development of sclerotic masses of varying sizes. Numerous other rheumatic diseases can present with characteristics of IgG4-RD, making it difficult to distinguish between them. However, cases of IgG4-RD involving the bilateral orbits, and pancreas with biological abnormalities are rare. We present a case of an 18-year-old female with vitiligo since the age of 3 years who presented with acute pancreatitis and acalculous cholecystitis, bilateral orbital masses, palpebral edema, and eosinophilia. The patient was diagnosed with IgG4-RD in keeping with clinical presentation and the elevated serum IgG4 level and after elimination of other differential diagnoses. The patient's symptoms gradually relieved after glucocorticoid therapy. This case presents an uncommon combination of clinical features infrequently reported in the literature. Multi-organ IgG4-RD is a multisystemic mass, commonly creating diagnostic challenges for clinicians. Furthermore, and more importantly, it highlights the need to keep a differential of IgG4-RD in mind, to aid in the early and correct treatment of the disease.