NCIt definition : 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
is usually used to guide the needle. The sample is examined under a microscope to
see if it contains cancer.;
Alternative definition : NCI-GLOSS: 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.;