[A Case of Needle Tract Seeding Discovered Three Years after Pancreatic Cancer Surgery and Treated with Local Gastrectomy].

A 70s-year-old man with pancreatic body cancer underwent evaluation by endoscopic-ultrasound guided tissue acquisition(EUS-TA), followed by distal pancreatectomy. Histopathological findings showed a well differentiated pT3N0M0 adenocarcinoma. Adjuvant S-1 chemotherapy was completed, and annual upper gastrointestinal endoscopy was performed. Three years postoperatively, a type 0-Ⅱc lesion was detected at the posterior gastric wall, at the location where the EUS-TA was performed. The initial biopsy showed no obvious malignant findings, but a repeat biopsy 6 months later revealed a well-differentiated adenocarcinoma. Therefore, we performed 4 courses of gemcitabine+nab-paclitaxel, subsequently performed partial gastrectomy. Histopathological findings of the resected stomach specimen showed a well differentiated adenocarcinoma extending from the subserosa to the submucosa. Then, we diagnosed as needle tract seeding(NTS)of pancreatic cancer. Twelve months after partial gastrectomy, there were no signs of recurrence. EUS-TA is a useful method for diagnosing pancreatic tumor. However, knowledge regarding NTS of pancreatic cancer due to EUS-TA is limited by the fact that this is a rare event. We herein report a case of NTS due to EUS-TA, which was performed partial gastrectomy.