Fig. 2

Preoperative and intraoperative findings of Case 1. a An esophagogastroduodenoscopy showed a diverticulum just under the esophageal orifice (white arrow). b An esophagogram showed a 2.5 cm-diameter diverticulum in the left side of the cervical esophagus (white arrow) and showed a cricopharyngeal bar presenting the cricopharyngeus muscle above the diverticulum (white arrowhead). c A cervical computed tomography showed an air-filled diverticulum arising from the left side of the cervical esophagus (black arrow). d Intraoperative findings. The diverticulum originated from the lateral wall of the cervical esophagus below the cricopharyngeus muscle, and the left recurrent laryngeal nerve lied very close to the base of the diverticulum.