ERUS

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