An ampullary adenoma presenting with jaundice caused by duodenal intussusception: a case report oleh Hiroyuki Nojima, Hiroaki Shimizu, Mihono Hirota, Takashi Murakami, Masato Yamazaki, Kazuto Yamazaki, Kiyohiko Shuto, Chihiro Kosugi, Mikihito Mori, Akihiro Usui, Tetsutaro Sazuka, Keiji Koda