Perihilar Biliary Neuroendocrine Carcinoma Treated With Perioperative Chemotherapy and Radical Liver Surgery: A Thought-Provoking Case. - Ataka, Ryo; Kitaguchi, Kazuhiko; Nakayama, Yusuke; Ikeno, Yoshinobu; Toyoda, Eiji; Hirose, Tetsuro (American Journal of Case Reports, 2026)