a biopsy marking apparatus for placing a radiopaque marker at the location of a percutaneous biopsy . the biopsy marking apparatus comprises an introducer in combination with a radiopaque marker . the introducer ejects the radiopaque marker at the location of the biopsy . the introducer is configured to completely eject the radiopaque marker and prevent it from being subsequently drawn into the introducer as the introducer is removed from the biopsied tissue mass . the radiopaque marker has enhanced radiopaque characteristics and enhanced non - migration characteristics .