Intracholecystic papillary-tubular neoplasm in a patient with choledochal cyst and anomalous pancreaticobiliary junction: case report

A 75-year-old female incidentally presented with an enhancing intraluminal gallbladder mass, main bile duct dilatation and anomalous pancreaticobiliary junction (APBJ) during the staging of gastric adenocarcinoma. Histopathological analysis confirmed the diagnosis of intracholecystic papillary-tubular neoplasm. Intracholecystic papillary-tubular neoplasms (ICPN) of the gallbladder are rare gallbladder neoplasms, defined as intramucosal, preinvasive, exophytic, mass forming lesions. An association between choledochal cysts and anomalous pancreaticobiliary junction with gallbladder neoplasms is well known, and this case potentially illustrates gallbladder carcinogenesis related to these biliary anomalies.