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NCI Dictionary of Cancer Terms


TRUS   

  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. TRUS is used to look for abnormalities in the rectum and nearby structures, including the prostate. Also called endorectal ultrasound, ERUS, and transrectal ultrasound.

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Transrectal 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.