—Andrews and Vernon30 state that ectopic ureter usually occurs in females. In women this anomaly leads to incontinence of part of the urine and normal vesical control of the remainder. In men the opening of the aberrant ureter is above the external sphincter and incontinence of urine does not occur. The most common site of an opening of an ectopic ureter in the female is in the vestibule near the external meatus. This is readily understandable when it is remembered that this structure, like the ureter, develops from the wolffian ducts. The vagina develops from the müllerian ducts, and a true ectopic vaginal ureter is rare. The vaginal opening of an ectopic ureter is nearly always situated on the anterior wall near the midline, but when the opening is near the cervix it tends to become more lateral. Only 5 cases in which an ectopic ureter opened
SCHOLL AJ, HINMAN F, VON LICHTENBERG A, et al. A REVIEW OF UROLOGIC SURGERY. Arch Surg. 1944;49(6):415–430. doi:10.1001/archsurg.1944.01230020425007
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