Abstract
On ordinary cholangiography, it is difficult to obtain well visualized cholangiogram of the caudate branches, because the majority of the caudate branches is located behind the hepatic hilum. Since July,1985, cholangiography in cephalad anterior oblique (CAO) position which is obtained by positioning the patient with body up or tilting the X-ray tube cephaladly was performed on eleven cases. Fine cholangiograms of the caudate branches were obtained by CAO position in all cases. CAO position was of value in identifying bile ducts of the caudate lobe and understanding their morphology.
