Pronunciation: (IN-truh-AH-pruh-tiv UL-truh-sownd)
A procedure that uses ultrasound (high-energy sound waves that are bounced off internal tissues and organs) during surgery. Sonograms (pictures made by ultrasound) of the inside of the body are viewed on a computer to help a surgeon find tumors or other problems during the operation. Also called IOUS.
Source: NCI Dictionary of Cancer Terms2010-02-02