gold fiducial marker seeds

Pronunciation: (… fih-DOO-shul MAR-ker …)

Tiny, gold seeds, about the size of a grain of rice, that are put in and/or around a tumor to show exactly where it is in the body. Doctors are then able to target the tumor directly and give higher doses of radiation with less harm to nearby healthy tissue. Also called gold fiducial markers, gold seeds, and gold-seed fiducial markers.

Source: NCI Dictionary of Cancer Terms