Transrectal biopsy is a biopsy procedure in which a sample of tissue is removed from the prostate using a thin needle that is inserted through the rectum and into the prostate.
[1] Transrectal ultrasound (TRUS) is usually used to guide the needle.
[2][3] The sample is examined under a microscope to see if it contains cancer.
This article incorporates public domain material from Dictionary of Cancer Terms.
U.S. National Cancer Institute.