NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,309 terms related to cancer and medicine.
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- listen (UL-truh-sownd)
- A procedure that uses high-energy sound waves to look at tissues and organs inside the body. The sound waves make echoes that form pictures of the tissues and organs on a computer screen (sonogram). Ultrasound may be used to help diagnose diseases, such as cancer. It may also be used during pregnancy to check the fetus (unborn baby) and during medical procedures, such as biopsies. Also called ultrasonography.