Advanced gastrointestinal endoscopic procedures: indications, imaging findings, and implications for the radiologist

There are a variety of advanced gastrointestinal endoscopic procedures, many of which are guided by endosonography, which are performed by interventional gastroenterologists or minimally-invasive surgeons. The purpose of this pictorial review is to briefly describe several advanced gastrointestinal endoscopically guided procedures, to review the implications for radiologists interpreting the associated imaging examinations, and to demonstrate the expected preprocedural imaging findings, as well as the expected and the unexpected postprocedural findings, in patients undergoing these procedures.