Fig. 4

Computed tomography findings. a Before preoperative chemotherapy, a tumor was observed in the middle of the esophagus (red arrows) with swollen lymph nodes in the mediastinum and around the cardia (yellow arrows), but there was no distant metastasis. b After preoperative chemotherapy, the tumor (red arrows) and swollen lymph nodes in the mediastinum and around the cardia (yellow arrows) were reduced