Preliminary study of the action of the Yag laser on canine prostatic adenoma and experimental urethral stenosis.

The authors used a Yag laser beam for channeling out canine prostatic adenoma (surgical or endoscopic transvesical approach) and experimental stenosis of the urethra (transperineal endoscopic route). A nitrogen flow introduced through the sheath of the fiber washed away the smoke created by the volatilization of the tissues and kept the bladder inflated at 10.15 cm H2O. The macroscopic and histologic findings immediately and 1 and 3 weeks following laser application demonstrated that the pathologic tissues were volatilized without bleeding or producing deep lesions in the neighboring areas (which were only moderated heated). The peripheric burnt area remained thin (2 cm) and precisely bordered by the intact parenchyma. The quantity of tissue removed was still insufficient but increasing the power and reducing the time of impact should improve the results.