Zenker’s diverticulum is a rare anatomic defect characterized by herniation of the hypopharyngeal mucosa between the inferior aspect of the inferior constrictor muscle and the cricopharyngeus muscle. Most patients are elderly and present with symptoms of dysphagia, regurgitation, chronic cough, aspiration, and weight loss [1]. The treatment of symptomatic Zenker’s diverticulum has evolved from open surgical approaches to minimally invasive endoscopic procedures [2].
Peroral endoscopic myotomy for Zenkerʼs diverticulum (Z-POEM) is an endoscopic technique where the principles of submucosal endoscopy are followed. The procedure is composed of a mucosal incision, submucosal tunneling, septotomy, and mucosal closure [3]. This procedure has the potential to reduce the risk of perforation and mediastinitis [4].
Herein, we report an older patient with a symptomatic Zenker’s diverticulum who was treated with Z-POEM using a scissors-type endoscopic submucosal dissection (ESD) knife, the SB Knife. The potential benefits of the SB Knife include that: submucosal tissue and vessels can be coagulated and cut simultaneously; full-thickness myotomy can be performed accurately and efficiently; and rates of perforation may be lower with the grasping of muscle during myotomy [5].
An 84-year-old woman with a past medical history of breast cancer was referred with increasing dysphagia and weight loss. A barium study confirmed a 1.5-cm Zenkerʼs diverticulum and the decision was made to proceed with Z-POEM.
The procedure was performed with the patient under general anesthesia. The diverticulum was at 9 oʼclock at the level of the upper esophageal sphincter with the endoscope in the resting position ([Fig. 1 a]). Submucosal injection was performed at the posterior aspect of the septum using a mixed solution of normal saline and methylene blue. A mucosal incision was made, followed by submucosal dissection with a triangle-tip knife (spray coagulation mode; effect 2 and 40 W). The muscular layer of the septum was exposed. Submucosal dissection was performed on the luminal side and the diverticular side until the tunnel was distal to the base of the Zenker’s diverticulum, the dissection being carried out for a total length of 3 cm ([Fig. 1 b]). A myotomy was performed using a standard SB knife, with a working length of 1.8 mm and maximal opening diameter of 2.6 mm, with cautery setting of Endocut Q current; effect 3, interval 1, and duration 1. A complete myotomy was performed after complete exposure of the septum ([Fig. 1 c]). The mucosal incision was closed with endoclips ([Fig. 1 d]; [Video 1]).
Fig. 1 Images of the peroral endoscopic myotomy (POEM) procedure for a Zenker’s diverticulum showing: a the diverticulum at the level of the upper esophageal sphincter in the resting position; b the finished tunnel with complete exposure of the septum; c septotomy being performed using a standard SB Knife; d secure closure of the mucosal incision using endoclips.
Video 1 Procedure of peroral endoscopic myotomy for a Zenker’s diverticulum using a scissors-type ESD knife.
There were no immediate complications. The patient was admitted overnight, and an esophagogram performed the next day showed no leakage. There is a risk of foreign body sensation with clip placement, but we have a preference for the placement of clips with short stalks to avoid this issue. At follow-up, the patient remained asymptomatic 90 days after undergoing Z-POEM.
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