A common urogenital sinus is when the proper division of body cavities does not occur while the baby is in the womb. The result is a common opening for the vagina and the urethra and sometimes genital ambiguity where the clitoris is bigger than normal, and the labia are fused to some degree. The common opening is referred to as the urogenital sinus. The correction of this anomaly or separation of the single systems into two may occur at various ages depending on when the patient presents (most often at birth), anatomy and genetic evaluation. Often a second procedure may be needed to widen the vaginal opening and the use of dilators is not uncommon. Surgical timing and technique must be determined on an individual basis.