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IgG4-Related Disease — Detailed Review

Multi-organ Fibroinflammatory Syndrome with Storiform Fibrosis

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Dahiliye (İç Hastalıkları) department. Book Appointment →

What is IgG4-Related Disease — Detailed Review?

IgG4-related disease (IgG4-RD) is a chronic, immune-mediated, fibroinflammatory disorder that can involve virtually any organ, presenting as tumor-like masses, organ enlargement, or fibrosis.

Histopathology demonstrates dense lymphoplasmacytic infiltrate with elevated IgG4+/IgG+ plasma cell ratios (typically >40%), characteristic storiform fibrosis, and obliterative phlebitis.

Common phenotypes include type 1 autoimmune pancreatitis, sclerosing cholangitis, sialoadenitis (Mikulicz syndrome), retroperitoneal fibrosis (Ormond disease), and orbital pseudotumor.

Diagnosis follows ACR/EULAR 2019 classification criteria combining clinical, serologic, radiologic, and histopathologic features; serum IgG4 levels are supportive but not specific.

Symptoms

Painless organ enlargement: salivary or lacrimal glands, pancreas, kidneys, lymph nodes, thyroid
Obstructive jaundice from sclerosing cholangitis or autoimmune pancreatitis with mass-like pancreatic lesions
Proptosis, periorbital swelling, or visual impairment from orbital pseudotumor
Back or flank pain, hydronephrosis, and lower extremity edema from retroperitoneal fibrosis
Allergic features: asthma, sinusitis, atopy with eosinophilia and elevated total IgE
Constitutional symptoms: weight loss, low-grade fever, fatigue (less common than in vasculitis)

Risk Factors

Middle-aged to elderly males (peak age 50–70 years; male-to-female ratio 3:1, except head and neck disease balanced)
Atopic background and allergic comorbidities
Specific HLA-DRB1 and FcγR genetic variants
Asian ancestry shows higher prevalence
Occupational exposures (solvents, asbestos) reported in some cohorts
History of allergy or eosinophilia preceding diagnosis

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Persistent painless gland or organ enlargement, particularly salivary or lacrimal glands
  • Obstructive jaundice with pancreatic or biliary mass on imaging
  • Proptosis, orbital swelling, or unexplained periorbital mass
  • Hydronephrosis with retroperitoneal soft-tissue mass on imaging
  • Multi-organ inflammatory disease with elevated serum IgG4

Treatment Methods

01
Induction with oral prednisone 0.6 mg/kg/day (typically 30–40 mg/day) for 2–4 weeks then taper over 3–6 months — produces dramatic clinical response in most patients
02
Rituximab 1 g IV ×2 doses (or 375 mg/m² weekly ×4) for relapsed, refractory, steroid-intolerant disease, or major organ involvement; B-cell depletion reduces IgG4-producing plasmablasts
03
Steroid-sparing maintenance: azathioprine, mycophenolate mofetil, or methotrexate in selected patients
04
Biliary stenting via ERCP for obstructive sclerosing cholangitis until medical therapy reduces inflammation
05
Ureteral stents or nephrostomy for retroperitoneal fibrosis with hydronephrosis pending steroid response
06
Surveillance imaging (MRI/CT) and serum IgG4 every 3–6 months; relapse occurs in 30–50% within 2 years
07
Patient education on glucocorticoid side effects, infection risk monitoring, and bone health (calcium, vitamin D, bisphosphonates)

Which Department to Visit?

You can visit our Dahiliye (İç Hastalıkları) department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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