HIFU, which stands for high intensity focused ultrasound, was first developed as a treatment of benign prostatic hyperplasia (BPH) and now is also being used as a procedure for the killing of prostate cancer cells. This procedure utilizes transrectal (across the rectum) ultrasound that is highly focused into a small area, creating intense heat of 80-100 C, which is lethal to prostate cancer tissue. However, the published clinical experience with HIFU for this application is limited and the procedure is not yet approved by the FDA for use in the United States.
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