Objective To investigate the anatomical features of threedimensional imaging of hilar cholangiocarcinoma

and to provide a reference for the preoperative evaluation and the formulation of surgical program for patients. Methods The image data of 103 patients with hilar cholangiocarcinoma who were admitted to the first affiliated hospital of China medical university from July 2014 to March 2018 were retrospectively analyzed. The multislice spiral CT images were converted to threedimensional images by Myrian system so as to study the anatomical characteristics. Results Among the 103 patients

the variation rate of portal vein in hilar region was 14.6%

the occurence rate of typical branch form

trifurcation type

Ishaped type was 85.4%

2.9%

11.7%

respectively.The variation rate of hilar bile ducts was 10.7%

including RPSD converging into LHD type

RPSD converging into CHD type and trifurcation type

with the incidence rate of 3.9%

3.9%

2.9%

respectively.The variation rate of hepatic artery was 21.4%

and the invasion rate of hepatic artery and portal vein were 40.0% and 13.6% respectively. Conclusion The variation of hepatic artery

portal vein and bile duct are common in hilar region.Threedimensional reconstruction can clearly show the stereoscopic anatomy of the blood vessels and dilated bile ducts in the liver and truly reflect the adjacent relationship and infiltration degree of the tumor

which has important clinical application value.