Müllerian aplasia and hyperandrogenism

Müllerian aplasia and hyperandrogenism (also known as Müllerian duct aplasia with hyperandrogenism) is an extremely rare condition characterized by the combination of absent or severely underdeveloped Müllerian duct-derived structures (uterus, fallopian tubes, and upper vagina) in 46,XX individuals, along with signs of excess androgen activity. Affected individuals are genetically female but present with primary amenorrhea (absence of menstruation) due to the absence of a functional uterus, while typically having normal female external genitalia and normal ovarian function otherwise. The hyperandrogenism component may manifest as hirsutism (excess body hair), acne, and elevated androgen levels in the blood, which can overlap clinically with features seen in polycystic ovary syndrome (PCOS). This condition affects the reproductive system primarily, with the Müllerian structures failing to develop properly during embryogenesis. The hyperandrogenism suggests an underlying hormonal dysregulation that distinguishes this entity from isolated Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, which involves Müllerian aplasia without androgen excess. The exact molecular etiology remains poorly understood, though the co-occurrence of these two features suggests a shared developmental or genetic pathway may be disrupted. Diagnosis is typically made during adolescence when affected individuals are evaluated for primary amenorrhea. Imaging studies such as pelvic ultrasound or MRI confirm the absence of the uterus and may reveal normal ovaries. Management is multidisciplinary and may include vaginal dilation therapy or surgical creation of a neovagina to allow sexual intercourse, as well as anti-androgen therapy or other hormonal treatments to manage hyperandrogenism symptoms. Fertility is not possible through natural conception due to the absence of a uterus, though assisted reproductive technologies with gestational surrogacy may be an option for genetic parenthood.

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