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Autoimmune pancreatitis is an idiopathic inflammatory disease of the pancreas that is rarely encountered even in paediatric patients. However, compared to adult patients, the clinical manifestation and course of the disease in children may differ. We present a case report of a 13-year-old boy admitted to our department with a history of abdominal pain, weight loss, vomiting, and sudden development of jaundice. Initial laboratory parameters showed signs of cholestasis, inflammatory parameters and pancreatic enzymes were in the normal range. ERCP examination demonstrated stenosis of the pancreatic part of ductus choledochus, sonography and MRCP examination showed lesion in the head of the pancreas and signs typical for autoimmune pancreatitis. Based on these findings, treatment with oral corticosteroids was started at an initial dose of 30 mg/day with a gradual reduction to the current maintenance dose, which is 5 mg of prednisone per day. The patient is currently in clinical remission; however, the exocrine dysfunction of the pancreas persists which we are solving by replacement of pancreatic enzymes. The aim of this paper is to present the basic features of the paediatric form of AIP and to point out the differences between AIP in children and adults. Keywords autoimmune pancreatitis, paediatric autoimmune pancreatitis, immunoglobulin G4, MRCP, steroids

Introduction: A solitary Peutz-Jeghers type hamartomatous polyp in the duodenum is rare. As compared with Peutz-Jeghers syndrome, Peutz-Jeghers type hamartomatous polyps are regarded as a different disorder. case report: We are reporting a case of a solitary hamartomatous polyp in the duodenum. A 24-year-old female was referred to our hospital with a diagnosis of duodenojejunal intussusception. We identified a polyp in the distal part of the duodenum. the patient underwent an endoscopic polypectomy. the polyp was confirmed to be a Peutz-Jeghers type of hamartomatous polyp. the patient underwent colonoscopy and small intestines follow-up with no evidence other polyps. conclusion: Previous reports have shown that solitary Peutz-Jeghers type hamartomatous polyps have malignant components in some cases. Patients with a duodenal solitary hamartomatous polyp should undergo treatment with complete removal of polyp and they need periodical follow- up examinations.