Mechanism of Fibrotic Anastomosis Formation in Endoscopic Ultrasound-guided Hepaticogastrostomy Using a Plastic Stent: Insights From an Autopsy Case of Perihilar Cholangiocarcinoma. - Maehara K; Mitsushita J; Shida T; Hirano K; Hattori D; Sato Y; Koyama R; Miura Y; Takazawa Y; Imamura T (DEN open, 2026)