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A liver metastasis is a malignant tumor in the liver that has spread from another organ affected by cancer. The liver is a common site for metastatic disease because of its rich, dual blood supply (the liver receives blood via the hepatic artery and portal vein). Metastatic tumors in the liver are 20 times more common than primary tumors. In 50% of all cases the primary tumor is of the gastrointestinal tract, other common sites include the breast, ovaries, bronchus and kidney.
Colorectal liver metastasis is Stage IV cancer that did not start in the liver, but instead has spread there from the colon or rectum. Colorectal cancer is one of the most common cancers in the United States.