Fig. 1

Radiographic and endoscopic examination of the mass. A X-ray examination shows an irregular approximately circular filling defect. B Endoscopic examination showed a gray-white mass in the esophageal lumen that was connected to the esophageal wall via a pedicle. C Contrast-enhanced computed tomography revealed a large mass obstructing the esophageal lumen without enlarged lymph nodes or invasion to the adjacent organs