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Persistent Müllerian duct syndrome
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Persistent Müllerian duct syndrome

Persistent Müllerian duct syndrome is a rare disorder of sexual development in males characterized by the presence of a uterus and fallopian tubes.

Overview

Affected individuals have normal male chromosomes (46,XY) and external male genitalia. However, they retain a uterus and fallopian tubes—structures that typically regress during early fetal development. The condition is often discovered during surgery for undescended testes (cryptorchidism) or inguinal hernias.

Symptoms

  • Cryptorchidism: Undescended testes, which may be unilateral or bilateral.
  • Inguinal hernias: Soft out-pouchings in the lower abdomen.
  • Hernia uteri inguinalis: A condition where the descended testis pulls the fallopian tube and uterus into the inguinal canal.
  • Transverse testicular ectopia: Both testes are pulled into the same inguinal canal.
  • Infertility: Inability to father children.
  • Hematospermia: Blood in the semen.

Causes

The condition is caused by mutations in the AMH gene or the AMHR2 gene. These genes produce the anti-Müllerian hormone and its receptor, which are responsible for the regression of the Müllerian duct in male fetuses. When these proteins are nonfunctional, the duct persists and develops into female reproductive organs.

Inheritance

Persistent Müllerian duct syndrome is inherited in an autosomal recessive pattern. Both parents of an affected individual typically carry one copy of the mutated gene but do not show symptoms. The condition only manifests in males; females with two mutated copies do not exhibit signs of the disorder.

Frequently Asked Questions

The presence of a uterus and fallopian tubes does not directly affect sperm production, but the associated cryptorchidism and potential testicular damage can reduce sperm count or motility. Many affected men can achieve biological parenthood with assisted reproductive technologies such as intracytoplasmic sperm injection (ICSI) using sperm retrieved from the testes or epididymis. In cases of severe infertility, sperm donation or adoption may also be considered.
Yes, the uterus and fallopian tubes can become a site for endometriosis, infection, or ectopic pregnancy if sperm were to fertilize an egg (rare but possible in rare cases of spontaneous ovulation). Even without fertilization, the retained Müllerian structures can cause chronic pelvic pain, hematometra (blood accumulation), or infertility-related complications. Regular follow‑up with a urologist or reproductive specialist is advised to monitor for these issues.
Because the condition is autosomal recessive, both parents are typically carriers. Genetic counseling can assess carrier status through DNA testing of the AMH or AMHR2 genes. Couples can discuss the 25% recurrence risk for each pregnancy, options for prenatal diagnosis (amniocentesis or chorionic villus sampling), or pre‑implantation genetic testing to select embryos without the mutation. Counseling also helps families understand the implications for male offspring and plan for early evaluation if cryptorchidism or inguinal hernias are detected.
During an inguinal or scrotal exploration for cryptorchidism, surgeons may notice a uterus, fallopian tubes, or a Müllerian duct remnant attached to the undescended testis. In some cases, imaging studies (ultrasound or MRI) performed pre‑operatively can reveal these structures, but the definitive diagnosis is usually made intra‑operatively when the unexpected female reproductive tract is visualized.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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