Fig. 1

Preoperative upper gastrointestinal imaging and esophagogastroduodenoscopy. a, b A giant tumor was seen, arising from the posterior wall of esophageal entrance and extending to the gastroesophageal junction, with the majority of the surface covered with normal mucosa. c, d There was a localized erythematous lesion on the tumor, and type B1 vessels were identified