Definition:

transrectal biopsylisten (tranz-REK-tul BY-op-see)

A 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. Transrectal ultrasound (TRUS) is usually used to guide the needle. The sample is examined under a microscope to see if it contains cancer.

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Transrectal biopsy; drawing shows a side view of the prostate, bladder, and rectum. Drawing also shows an ultrasound probe with a needle inserted into the rectum to remove a tissue sample from the prostate.