Diagnostic and surgical challenges of a lymph node metastasis from occult gastric cancer mimicking a pancreatic head tumor: A case report. - Ando, Takuya; Hirose, Yuki; Takizawa, Kazuyasu; Sakata, Jun; Ishikawa, Hirosuke; Abe, Shun; Kawachi, Yusuke; Nakano, Mae; Ichikawa, Hiroshi; Shimada, Yoshifumi; Wakai, Toshifumi (Oncology Letters, 2026)