OUTLINE: This is an open-label, multicenter study. A probe is inserted into the rectum. Ultrasound energy is then delivered through probe to prostate tissue over 2-3 hours. Quality of life is assessed at study initiation; at 14 days and 3, 6, and 12 months; and then annually thereafter. Patients are followed at 14 days; at 3, 6, 9, and 12 months; and then annually thereafter.