{Reference Type}: Case Reports {Title}: Cap-fitted ultrathin endoscope-assisted endoscopic retrograde cholangiopancreatography (ERCP) for patients with hidden papillae in duodenal diverticula. {Author}: Hayashi S;Ito Y;Higashi R; {Journal}: J Hepatobiliary Pancreat Sci {Volume}: 31 {Issue}: 7 {Year}: 2024 Jul 24 {Factor}: 3.149 {DOI}: 10.1002/jhbp.1434 {Abstract}: Hayashi and colleagues developed a novel salvage technique using a cap-fitted ultrathin endoscope to cannulate the bile duct when a papilla concealed within a duodenal diverticulum is inaccessible with conventional methods. It can be a useful and safe option for endoscopic retrograde cholangiopancreatography in patients with papillae hidden in duodenal diverticula.