This document discusses various types of endoscopy procedures. It describes cholangioscopy, which is used to treat bile duct stones and evaluate biliary strictures. Endoscopic fistula closure is discussed as a way to close gastrointestinal perforations. Endoscopic mucosal resection and endoscopic submucosal dissection are described as minimally invasive techniques to remove benign and early malignant lesions. Upper endoscopy and colonoscopy are summarized as procedures to examine the upper and lower gastrointestinal tract respectively. Potential risks associated with these endoscopic procedures include sedation side effects, bleeding, perforation, and infection.