ETR. Definition

Medical Definition: ETR

A procedure in which is inserted into the rectum a probe that emits high-energy sound waves. The sound waves bounce off internal tissues or organs and make echoes. The echoes form a picture of body tissues called a sonogram. The ETR is used to check for abnormalities in the rectum and nearby structures, including the prostate. Also called endorectal ultrasound, transrectal ultrasound, and ROA.

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