What Is Autoimmune Pancreatitis?

Autoimmune pancreatitis (AIP) is a rare, chronic inflammatory disease of the pancreas that is caused by an abnormal immune response. The disease is characterized by a lymphoplasmacytic infiltration and fibrosis of the pancreatic tissue, often resulting in pancreatic enlargement, irregular narrowing of the pancreatic duct, and, in some cases, involvement of other organs. AIP is considered part of the spectrum of IgG4-related diseases.

What Causes Autoimmune Pancreatitis?

The precise cause of autoimmune pancreatitis is unknown. It is believed to involve genetic and immunological factors that trigger an autoimmune reaction against the pancreas. Types of AIP include:

• Type 1 AIP (IgG4-related): Often associated with elevated serum IgG4 levels and can involve other organs, such as the bile ducts, salivary glands, or kidneys.
• Type 2 AIP: Does not involve IgG4 and is typically confined to the pancreas; sometimes associated with inflammatory bowel disease.

Symptoms of Autoimmune Pancreatitis

The clinical presentation may be non-specific and can mimic pancreatic cancer. Common symptoms include:

• Painless jaundice (yellowing of skin and eyes due to bile duct obstruction)
• Upper abdominal discomfort or pain
• Weight loss
• New-onset diabetes or worsening glycemic control
• Symptoms related to biliary obstruction (dark urine, pale stools, itching)
• Less commonly, acute pancreatitis symptoms (nausea, vomiting, acute abdominal pain)

How Is Autoimmune Pancreatitis Diagnosed?

Diagnosis relies on a combination of clinical, imaging, laboratory, and sometimes histological findings:

• Clinical history and physical examination
• Imaging studies (CT, MRI, or endoscopic ultrasound) showing diffuse or focal pancreatic enlargement, ductal strictures, or mass-like lesions
• Serologic tests, especially elevated serum IgG4 (in Type 1), and exclusion of cancer markers
• Endoscopic retrograde cholangiopancreatography (ERCP) for detailed ductal imaging
• Histopathology (pancreatic or extrapancreatic tissue biopsy) if diagnosis remains uncertain or malignancy must be ruled out
• Assessment for involvement of other organs

Treatment of Autoimmune Pancreatitis

The primary treatment for AIP is immunosuppressive therapy:

• Systemic corticosteroids (prednisolone) are the mainstay and typically result in rapid clinical and radiologic improvement
• Immunomodulatory or steroid-sparing agents (such as azathioprine or mycophenolate mofetil) may be used for relapsing or steroid-resistant cases
• Treatment of secondary diabetes and management of exocrine insufficiency as needed
• Biliary stenting or supportive interventions if there is persistent bile duct obstruction
• Long-term follow-up to monitor for relapse, response to therapy, and involvement of other organs

Risks and Complications of Autoimmune Pancreatitis

Possible risks and complications include:

• Relapses of autoimmune pancreatitis
• Progression to chronic pancreatitis and irreversible pancreatic insufficiency
• Misdiagnosis as pancreatic cancer, potentially leading to unnecessary surgery
• Diabetes mellitus and malabsorption due to exocrine insufficiency
• Complications related to long-term corticosteroid use (osteoporosis, infections, etc.)

Which Physicians and Clinics Specialize in Autoimmune Pancreatitis?

Diagnosis and management of AIP are provided by gastroenterologists with expertise in pancreatic diseases, often involving multidisciplinary care with radiologists, pathologists, endocrinologists, and, if needed, surgeons. Specialist centers may offer advanced imaging, histopathology, and personalized long-term care.

Someone who needs a doctor naturally wants the best possible medical care. That’s why many patients ask where they can find an excellent treatment centre. Since this cannot be answered objectively—and a reputable doctor would never claim to be “the best”—affected people can only rely on a doctor’s proven expertise and experience.

We help you find an expert for your condition. All doctors and clinics listed here have been reviewed by us for their outstanding specialization in the field of autoimmune pancreatitis and are ready to receive your inquiry or treatment request.