title: Diffuse type autoimmune pancreatitis: the first case report in Thailand.
abstract: BACKGROUND
  Autoimmune pancreatitis (AIP) is a recently-recognized form of pancreatitis mimicking pancreatic cancer (PaC) but treatable with corticosteroid. There is one report of focal-type AIP in Thailand. Here we presented the first case report of diffuse-type AIP.
  
  
  METHODS
  A 76-year-old man presented with 10-day obstructive jaundice. Computed tomography (CT) showed obstructive jaundice from diffusely swollen pancreas, which had a characteristic capsule-like rim non-enhancement pattern of AIP. Serum immunoglobulin G4 (IgG4) was elevated of 468 mg/dL. Endoscopic ultrasound-guided fine needle aspiration demonstrated no PaC. Prednisolone 40 mg/day was started. Jaundice disappeared in 2 weeks and follow-up CT demonstrated normalization of swollen pancreas.
  
  
  CONCLUSIONS
  Diffuse-type AIP does exist in Thailand. Recognition of this condition is critical to avoid misdiagnosis of PaC or unnecessary surgery.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Varayu
authors.initials: V
authors.lastname: Prachayakul
authors.forename: Pitulak
authors.initials: P
authors.lastname: Aswakul
authors.forename: Piyaporn
authors.initials: P
authors.lastname: Apisarnthanarak
authors.forename: Supot
authors.initials: S
authors.lastname: Pongprasobchai
mesh_terms: D000368:Aged; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage; D001327:Autoimmune Diseases / Q000175:diagnosis* / Q000276:immunology / Q000473:pathology; D006801:Humans; D008297:Male; D010195:Pancreatitis / Q000175:diagnosis* / Q000276:immunology / Q000473:pathology; D011239:Prednisolone / Q000008:administration & dosage; D013785:Thailand; D014057:Tomography, X-Ray Computed
chemical_list: D000893:Anti-Inflammatory Agents; D011239:Prednisolone