Metastatic cancer is cancer that has spread from the part of the body where it started (its primary site) to other parts of the body. Keep in mind that when cancer spreads in this way it is still named after the part of the body where it started.
Sometimes the “new” tumors have already begun to grow when the cancer is first found. In some cases the metastasis may be found before the primary tumor is found. If cancer is widely spread throughout the body when it is found, it may not possible to tell where it started. This is called cancer of unknown primary. It is covered in a separate American Cancer Society document.
source: http://www.cancer.org
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