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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 is a word used to describe the spread of cancer. Unlike normal cells, cancer cells have the ability to grow outside of the place in the body where they originated. When this happens, it is called metastatic cancer.Nearly all types of cancer have the ability to metastasize, but whether they do depends on a variety of individual factors. Metastases can occur in three ways: 1  They can grow directly into the tissue surrounding the tumor;hen this happens, it is called metastatic cancer. Nearly all types of cancer have the ability to metastasize, but whether they do depends on a variety of individual factors. Metastases can occur in three ways: 1  They can grow directly into the tissue surrounding the tumor;