Bile duct cancer embolism is not a bile duct tumor, often caused by hepatocellular carcinoma, gallbladder cancer secondary to the clinical most common is hepatocellular carcinoma, cancer embolism is soft and fragile, obstruction of the bile duct caused by obstructive jaundice, and this jaundice is fluctuating, because the cancer embolism can be necrotic off, so the jaundice of patients with cancer embolism can sometimes be relieved or improved. However, this relief is an illusion and will come back in the short term. The cancer embolus does not cause bile duct stricture; instead, it causes bile duct dilatation, which can be seen on imaging as a soft tissue image inside the dilated bile duct; the imaging is a filling defect visible inside the dilated bile duct. The slightest irritation or contact can cause bleeding in the bile ducts and aggravate jaundice or biliary infection. Cancerous emboli are difficult to treat, and I personally advocate simple drainage drains to improve jaundice, and surgical procedures should be done with caution, as cancerous emboli are not easily removed intact. Biliary stents cannot be placed, and only a few cases can be treated with overlying biliary stents (without involvement above the hepatoportal area), and only when jaundice is improved can further oncologic treatment be performed, so treatment of cancer emboli should be very cautious. The prerequisite is adequate drainage and improvement of jaundice.