The method for the surgical treatment of the acute pancreatitis complicated with postnecrotic pseudocyst comprises the internal endoscopic drainage of postnecrotic pseudocyst via cytodigestive fistula using electrocoagulation technique. The wide pneumodilatatiion of the cytodigestive fistula up to 15-18 mm in diameter is provided step by step. In the course of the first endoscopic intervention, the lumen of the cytodigestive fistula is widened with the aid of endoscopic balloon up to 10 mm in diameter with the concomitant endoscopic retrograde cholangiopancreatography. When the integrity of the pancreatic duct is impaired, the provisional endopancreatic stent 5-7 Fr is installed in a way that the distal end of the stent is extended over the site of the impaired integrity. The second endoscopic intervention follows in 24-48 hours. The lumen of the cytodigestive fistula is widened up to 15-18 mm in diameter. Then the endoscopic pancreatosequestrectomy is performed with the aid of basket forceps. After each procedure, two double-pigtail endoprostheses 10 Fr are inserted into the cavity of postnecrotic pseudocyst and cystic-nasal drainage is installed. Every 4-6 hours, the drainages are washed with 0.9 % physiologic saline.
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