Fig. 4

a, b Upper gastrointestinal radiography and (c, d) CT on hospital day 22. The findings revealed that there is leakage of the contrast from the esophagus to the left pleural cavity (a, c, and d, white arrow) and pleural effusion in bilateral thoracic cavities b, c, and d, white arrowhead). e, f EGD finding; the ulcer around the perforation (e, white arrow) and the perforation on the esophageal wall (f, white arrow)