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CEarlier studies concentrated on the ultrasonic appearances of prostate abnormalities such as benign prostatic hyperplasia (BPH), carcinoma of the prostate (CAP), prostatitis, prostatic abscess, and prostatic calculi. Since the introduction of the prostate-specific antigen (PSA) screening test and early detection of prostate cancer, the role of transrectal ultrasound (TRUS) has changed; it is
mainly used to image the prostate and to aid in guided needle biopsy. Urologists have incorporated TRUS in their practices; moreover, TRUS also is widely used to deliver treatments such as brachytherapy and to monitor cryotherapy treatment for prostate cancer
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