It is very good that they are doing an endoscopic ultrasound. I have heard that you can have your gall bladder removed and still have a duct blocked by a gall stone. you need to have the specific MRI to detect any stones. After years of pain, after removal of gall bladder finally the MRCP located the problem. Finally had the stone removed by ERCP. Please find a special gastroenterologist who will do this procedure !!!!!!