The CoreTainer® is designed specifically for stereotactic core needle breast biopsy samples. It minimizes the need to handle delicate core samples more than once and provides superb image quality. Five individual compartments, each with a radiolucent number in the orientation of a clock face, make it easy to identify and communicate the location of cores with calcifications from the specimen radiograph. A watertight lid accommodates formalin and is safe for transporting specimens to pathology. This one step system saves time, improves interdepartmental communication and helps maintain the integrity of fragile core biopsy specimens.