It's well known that cancers metastasize to organs via lymphatic as well as venous vessels. Associate professor Kengo Yoshimitsu (Dept. of Clincial Radiology) estimates the metastatic mechanism using an angio-computer-tomography. He applied this new equipment to inject contrast medium into an artery of the gallbladder for making a three-dimensional tomogram of its venous drainage, and found the gallbladder cancer metastasizes to the liver via venous system.