Review of diagnostic and therapeutic endoscopic retrograde cholangiopancreatography using several endoscopic methods in XXXX with surgically altered gastrointestinal anatomy.

@entity1 @entity29 @entity253 @entity661 @entity4649
The endoscopic approach for @entity253 in @entity1 with surgically altered gastrointestinal anatomy (SAGA) had been generally deemed impractical. However, it was radically made feasible by the introduction of double balloon endoscopy (DBE) that was originally developed for diagnosis and treatments for @entity29 . Followed by the subsequent development of @entity661 ( @entity661 ) and @entity4649 ( @entity4649 ), interventions using several endoscopes for @entity253 in @entity1 with SAGA widely gained an acceptance as a new modality. Many studies have been made on this new technique. Yet, some problems are to be solved. For instance, the mutual unavailability among devices due to different working lengths and channels, and unestablished standardization of procedural techniques can be raised. Additionally, in an attempt to standardize endoscopic procedures, it is important to evaluate biliary cannulating methods by case with existence of papilla or not. A full comprehension of the features of respective scope types is also required. However there are not many papers written as a review. In our manuscript, we would like to evaluate and make a review of the present status of diagnostic and therapeutic endoscopic retrograde cholangiopancreatography applying DBE, @entity661 and @entity4649 for @entity253 in @entity1 with SAGA for establishment of these modalities as a new technology and further improvement of the scopes and devices.
