Objective — to evaluate the results of endoscopic cystogastrostomy and cystoduodenostomy for benign pancreatic cysts ic lesions. Material and methods. There were 23 patients with acute pancreatitis and pancreatic pseudocyst. All patients underwent an ultrasound at admission to diagnose pancreatic cysts. This disease was an indication for cystogastrostomy. Cystotome was inserted into the cystic cavity through the stomach or duodenum depending on localization of pancreatic pseudocyst. Aspiration of contents was followed by X-ray contrast-enhanced examination of cyst in order to determine its dimensions and impermeability, communication with pancreatic ducts. Plastic or metal stent was then installed and a visual assessment was performed. Abdominal X-ray examination was performed immediately after stenting to establish the presence or absence of free gas. Endoscopic ultrasound was made in 2 and 7 days after cystogastrostomy to assess drainage of the pseudocyst. Inadequate drainage was cured with cystonasal drainage using nasobiliary drainage tube and subsequent daily sanation of the cyst. Results. Endoscopic drainage of pseudocyst under endoscopic ultrasonic control was followed by complete regression of cystic cavity in 81.8% of patients and more than 2-fold decrease of its volume in 18.2% of cases. Conclusion. High efficiency of endoscopic drainage of pseudocyst under endoscopic ultrasonic control was proven. This method is characterized by minimal invasiveness, trivial risk of postoperative complications and mortality, and short postoperative hospitals-stay compared with laparotomy or laparoscopic procedures.