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" ... The procedure being scrutinized at UCLA is endoscopic retrograde cholangiopancreatography, or ERCP, which allows physicians to examine and treat a number of problems of the pancreas and biliary system. Many of these problems required open surgery before; some were untreatable. Now, through an endoscope, a flexible device that is passed through the mouth and down through the stomach to the duodenum, the first part of the small bowel, physicians can do biopsies and small surgeries, including putting in stents (plastic tubes) to bypass blockages from cancer or gall stones, for example—procedures that were not previously possible. ... "