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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.
METASTASIS means one tumor. METASTASES is plural â it means two or more tumors. METASTASIZE is the process of cells traveling through the. body to reach another part of the body. PRIMARY SITE refers to the location of the original cancer. Lung, breast, melanoma (skin cancer), colon and. kidney cancers commonly spread to the brain.