Laser BPH Treatment Systems involves laser coagulation and laser vaporization. In laser coagulation, relatively low-density laser thermal energy is used to produce tissue coagulative necrosis, with a potential for delayed anatomical debulking. Clinically significant anatomical debulking occurs only if the tissue is allowed to slough, which takes place when the prostatic urothelium is involved in the process. Preservation and protection of the prostatic urothelium from laser thermal damage prevents tissue sloughing. For laser vaporization, higher-density laser thermal energy is used. This high energy raises the tissue temperature to several hundred degrees Celsius, causing its vaporization. Additionally, various degrees of coagulation necrosis take place in the adjacent residual tissue. This principle is used in different ways to achieve a variety of objectives, depending on the amount and site of tissue vaporization. These range from complete tissue vaporization to incision, resection, or enucleation of the obstructing prostatic tissue. Irrespective of the technique used, the final common result is "opening″ (ie, anatomical deobstruction) of the prostatic urethra.