In a Nissen fundoplication, also called a complete fundoplication, the fundus is wrapped the entire 360 degrees around the esophagus. In contrast, surgery for achalasia is generally accompanied by either a "Dor" or "Toupet" partial fundoplication, which is less likely than a Nissen wrap to aggravate the dysphagia that characterizes achalasia. In a Dor (anterior) fundoplication, the fundus is laid over the top of the esophagus; while in a Toupet (posterior) fundoplication, the fundus is wrapped around the back of the esophagus.