<prompt> The most impoant use of transrectal ultarsonography TRUS is forScreening for Ca prostateDistinguishing prostate cancer from BPHSystematic prostate biopsy in suspected prostate cancerGuiding transurethral resection of prostate cancer  <response>: A transrectal ultrasound TRUS may also be called endorectal ultrasound. It is used to look at the prostate and tissues around it. A TRUS is often used to help diagnose prostate cancer if the prostate-specific antigen PSA level is high, or an abnormal area during a digital rectal exam DRE . TRUS is done to: look at the size and shape of the prostate look for abnormal areas in the prostate guide a needle during a biopsy to collect samples from the prostate TRUS technology has become a mainstay of many image guided prostate interventions, including prostate biopsy, brachytherapy, cryotherapy, and high-intensity focused US Campbell and walsh 11th edition 