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.
Last updated: 2014-05-21
Source: The National Cancer Institute's Dictionary of Cancer Terms (http://www.cancer.gov/dictionary)