Aim: To present a case report of choristoma of the stomach. Introduction: Ectopic pancreas is defined as the presence of pancreatic tissue outside its normal location without anatomic or vascular connections with the pancreas. It mostly occurs in upper gastrointestinal tract, predominantly in the stomach. It s likely to occur in men, at the age of 30-50 years. Case report: A thirty-year old male patient presented to the hospital for evaluation of epigastric symptoms. After clinical examinations, he underwent an esophago-gastroduodenoscopy which showed intramural tumor located along the greater curvature. The biopsy was taken which revealed normal gastric mucosa so it was suspected for gastrointestinal stromal tumor. The patient was submitted to laparoscopic partial gastrectomy and the material was received for pathohistological analysis. Macroscopically, there were several fragments, gray-pink coloured and lined with pink mucosa. In the largest fragment it was noticed irregular, oval gray-white node, measured 4x2.5x0.5cm. On serial cutting it was yellow. Histologically, described fragments revealed normal fundic mucosa and irregular node was consisted of pancreatic tissue localized in submucosa and lamina muscularis. It was formed of normal acini and Langerhans islets, with focally dilated pancreatic ducts and presence of mixed inflammatory infiltrate. Dysplasia wasn t found in the pancreatic tissue. The POSTER SESIJA 58 MATERIA MEDICA • Vol. 34 • Issue 1, suplement 1 • april 2018. established diagnosis was Ectopic pancreatic tissue in stomach Choristoma of the stomach. Conclusion: Choristoma is rare condition and usually incidental finding important to be diagnosed because of the serious complications depending on which tissue is present in the organ, such as inflammation, bleeding and mailignant transformation.