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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.

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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.

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