Abstract: Meatal-hymenal deformity is a predisposing cause of thelower urological tract infection in females which isusually followed by sexual activity, menstruation orvaginitis. The urethral external orifice is usuallynarrowed owing to the deforming meatal-hymen.Morphologically, meatal-hymeneal deformity isclassified into volcanic hymen and valvular hymen.Since May of 1985, 132 cases of meatal-hymenaldeformity were treated with CO$-2$/ laser at awavelength of 10.6 $mu@m and at an output power of 20w. A wedge shape incision was made above the urethralexternal orifice accompanied by regional hymenvaporization at the bottom or on both side. Periodicexpansion of urethra and lavation with 1/2000bromo-geramine solution followed. The value of themethod is simple in operation, without complication,not necessary to be in charge and with a satisfyinghealing rate of 97 percent. In this study, we discussthe pathological changes causing the lower urologicaltract infection in females, the operating methods,theory and advantages of CO$-2$/ laser therapy. !0
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