Partial bilateral aplasia of the Müllerian ducts

Partial bilateral aplasia of the Müllerian ducts is a rare congenital anomaly of the female reproductive tract in which portions of both Müllerian (paramesonephric) ducts fail to develop properly during embryonic life. The Müllerian ducts are the embryological structures that normally give rise to the fallopian tubes, uterus, cervix, and upper portion of the vagina. When partial bilateral aplasia occurs, affected individuals may present with absence or underdevelopment of segments of these structures on both sides, which can manifest as uterine hypoplasia or aplasia, absent or rudimentary fallopian tubes, cervical aplasia, and/or upper vaginal agenesis. The specific clinical presentation depends on which segments of the ducts are affected. This condition primarily affects the female reproductive system. Key clinical features may include primary amenorrhea (absence of menstruation), infertility, and in some cases cyclic pelvic pain if functional endometrial tissue is present but outflow is obstructed. The condition is typically recognized at puberty when menstruation fails to occur, or later during evaluation for infertility. It may overlap with or be classified under the broader spectrum of Müllerian duct anomalies, including Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, though partial bilateral aplasia represents a distinct pattern of malformation. Treatment is individualized based on the specific anatomical findings. Surgical interventions may include creation of a neovagina (vaginoplasty) if the vagina is absent, and reconstructive procedures to address uterine or cervical anomalies where feasible. Assisted reproductive technologies may be considered for fertility, and in cases of complete uterine absence, gestational surrogacy or uterine transplantation may be options. Psychological support is an important component of care given the impact on reproductive and sexual health.

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