NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,804 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

endorectal ultrasound
(en-doh-REK-tul UL-truh-sownd)
A procedure in which a probe that sends out high-energy sound waves is inserted into the rectum. The sound waves are bounced off internal tissues or organs and make echoes. The echoes form a picture of body tissue called a sonogram. Endorectal ultrasound is used to look for abnormalities in the rectum and nearby structures, including the prostate. Also called ERUS, transrectal ultrasound, and TRUS.

EnlargeTransrectal ultrasound; drawing shows a side view of the male reproductive and urinary anatomy including the prostate, anus, rectum, and bladder; also shows an  ultrasound probe inserted into the rectum to check the prostate. Inset shows patient lying on back on a  table having a transrectal ultrasound procedure.

Transrectal ultrasound. An ultrasound probe is inserted into the rectum to check the prostate. The probe bounces sound waves off body tissues to make echoes that form a sonogram (computer picture) of the prostate.