Fig. 2

a Intraoperative findings for case 1. A small hard mass was detected in the posterior gastric wall, as indicated by the forceps. b Partial resection of the posterior gastric wall was performed. c Pathological findings. The specimen from the partially resected stomach showed that an adenocarcinoma was distributed linearly in the gastric muscle layer (arrow) (hematoxylin and eosin staining, loupe image). d Pathological findings. The findings of the gastric tumor were similar to those of the primary pancreatic cancer, indicating that gastric tumor was needle tract seeding from pancreatic cancer (hematoxylin and eosin staining)