Today, many GI tract diseases that once required surgery can be treated without incisions. Two such conditions include achalasia, a swallowing disorder, and early-stage gastric and esophageal cancers.
http://health.clevelandclinic.org/2014/10/endoscope-offers-smart-fixes-for-your-serious-digestive-problems/
Endoscope Offers Smart Fixes for Your Serious Digestive Problems