Retrograde portography of the right caudate lobe via the middle hepatic vein.

Hepatobiliary resection with caudate lobectomy has been conducted in the surgical treatment of bile duct carcinoma of the hepatic hilus. However, insufficient attention has been paid to the anatomy of the right portion of the caudate lobe, and techniques to visualize the portal branches of the right caudate lobe (P1r) have not been reported. Contrast medium was injected into the dorso-caudal branches of the middle hepatic vein (MHV) and images were obtained by digital subtraction venography. Retrograde portography of the P1r was achieved in 64 (84%) out of 76 cases. The mean number of visualized branches was 2.1 (137 out of 64) and the P1r coursed beyond the trunk of the MHV in 36 (56%) out of the 64 cases. Contrast medium flowed into the right portal vein from 59 P1r branches in 32 cases and into the left portal vein in 20 cases. No complications were encountered. Retrograde portograms of the P1r may provide valuable information not previously available to surgeons operating on the caudate lobe.