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NCI Dictionary of Cancer Terms

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intraoperative ultrasound  listen  (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.