Concomitant hilar cholangiocarcinoma with choledochal cyst and cholelithiasis in an asymptomatic patient: A case report

•Choledochal cyst and cholelithiasis are the risk factors for cholangiocarcinoma.•Concomitant perihilar cholangiocarcinoma with choledochal cyst and cholelithiasis without symptoms is rare.•Proper clinical evaluation along with multimodal imaging is essential for diagnosis and management.•Surgical R0 resection including adequate perihilar and pericholedochal lymph node removal is important for surgical clearance.