Cholecystectomy Drainage Endoscopy Humans Necrosis Pancreas Pancreatitis, Acute Necrotizing Short Survey Treatment Outcome abdominal pain acute hemorrhagic pancreatitis acute pancreatitis adult bile duct dilatation bile duct fistula biliary tract surgery case report cholecystectomy cholelithiasis clinical article common bile duct stone computer assisted tomography contrast medium extravasation diagnostic imaging direct endoscopic necrosectomy disease exacerbation disease severity endoscopic retrograde cholangiopancreatography endoscopic surgery endoscopic transgastric cholecystectomy