II.4.a. Intervention All laser surgeries will be performed or supervised by a single surgeon with large experience with laser prostate surgery. Procedures will be performed with the patient under general or regional anesthesia. Normal saline will be used as an irrigant. The GreenLight (532 nm) laser generator (XPS) will be used with our previously described technique for Group I. A side-to-side sweeping technique was used with the side firing fiber moving from the area of the bladder neck to approximately the level of the verumontanum. As much as possible, the end point of the laser procedure was a TURP-like cavity lined by capsular fibers, as judged by the operator.