Right-sided Zenker's diverticulum resected using intraoperative neuromonitoring.

Right-sided Zenker's diverticulum is a rare pharyngoesophageal diverticulum. The risk of intraoperative injury of the recurrent laryngeal nerve is high during transcervical diverticulectomy because this nerve presents many variations of extralaryngeal bifurcation before entry into the larynx. We present a case of right-sided Zenker's diverticulum that was safely resected with the use of intraoperative neuromonitoring to prevent right recurrent laryngeal nerve injury. A 55-year-old man complaining of chronic cough and regurgitation of ingested food was diagnosed as having right-sided Zenker's diverticulum and underwent open transcervical diverticulectomy and cricopharyngeal myotomy. The location of the right recurrent laryngeal nerve was accurately determined during dissection by intermittent stimulation using a monopolar stimulation probe of an intraoperative neuromonitoring system to avoid injury. The postoperative course was uneventful, and postoperative evaluation showed no vocal cord paralysis. Intraoperative neuromonitoring may be beneficial during transcervical diverticulectomy for right-sided Zenker's diverticulum nearby the right recurrent laryngeal nerve, which can present with many variations of extralaryngeal bifurcation.