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Principle of FLA. The diffusing laser fiber was introduced by transperineal way (schematic midline sagittal section of prostate, bladder, urethra, and striated sphincter). BW: bladder wall; BN: bladder neck; U: urethra; SS: striated sphincter; RUM: rectourethral muscle; RW: rectal wall; PZ: peripheric zone; C: capsule of prostate; DF: Denonvilliers' fascia; VPM: vesicoprostatic muscle; PSVF: posterior seminal vesicle fascia; PPF: posterior prostatic fascia.
