Endoscopic Treatment for Zenker's Diverticulum

Patients will be placed in left lateral decubitus position, either in conscious sedation or under deep sedation with propofol or endotracheal intubation.The procedure will be performed with a flexible standard endoscope and started with initial endoscopic examination with suction of possible retained material insidethe diverticulum. An incision of the bridge between the ZD and the esophagus will be done (using one endoscopic procedure as POES or FESD or other)