Transverse vaginal septum

Transverse vaginal septum is a rare congenital malformation of the female reproductive tract in which a horizontal wall of tissue partially or completely obstructs the vaginal canal. It results from a failure of complete fusion or canalization between the müllerian ducts (which form the upper vagina and uterus) and the urogenital sinus (which forms the lower vagina) during embryonic development. The septum can occur at any level of the vagina — upper, middle, or lower third — with the most common location being the upper vagina. The septum may be complete (imperforate, fully blocking the vaginal canal) or incomplete (perforate, containing a small opening). Clinical presentation depends on whether the septum is complete or incomplete. A complete transverse vaginal septum typically presents at puberty with primary amenorrhea (absence of menstrual periods), cyclic pelvic pain, and hematocolpos (accumulation of menstrual blood behind the septum). In neonates, a complete septum may cause hydrocolpos or mucocolpos due to accumulation of cervical and vaginal secretions stimulated by maternal estrogen. An incomplete septum may present later with difficulty using tampons, dyspareunia (painful intercourse), prolonged menstrual periods, or infertility. If left untreated, complications can include endometriosis, pelvic infections, and fertility problems. Diagnosis is made through clinical examination and imaging studies such as pelvic ultrasound or MRI, which help determine the location and thickness of the septum. Treatment is surgical, involving excision of the septum and reanastomosis (reconnection) of the upper and lower vaginal segments. Surgical outcomes are generally favorable, particularly for thin septa. Thicker septa, especially those located in the upper vagina, may require more complex surgical approaches and carry a higher risk of vaginal stenosis (narrowing) postoperatively. Long-term follow-up is recommended to monitor for restenosis and to address any fertility concerns.

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