MURCS Association

What happens in MURCS association

In early pregnancy, the Müllerian ducts form the uterus, fallopian tubes, cervix and upper two thirds of the vagina. The kidneys and the spine develop at around the same time and nearby in the embryo. In MURCS, development of these structures is disrupted together:

• The uterus and upper vagina are absent or rudimentary. The lower vagina may be a short pouch.
• The ovaries are present and normal, so hormones, breast development and ovulation are normal.
• One kidney may be missing (unilateral renal agenesis), small or out of place.
• Vertebrae in the neck and upper back may be fused or malformed, such as Klippel-Feil anomaly, sometimes with scoliosis.

Chromosomes are typically 46,XX. The cause is not fully understood. Most cases occur without a family history, though genetic factors are suspected.

Symptoms

• No periods (primary amenorrhea) despite normal breast development and pubic hair, usually the first sign
• Difficulty using tampons or pain or inability to have penetrative sex
• Short stature in some
• Neck stiffness or limited neck movement from fused vertebrae, and sometimes back problems or scoliosis
• Hearing loss in some people
• Kidney-related problems, usually none if the remaining kidney is healthy
• Occasionally cyclical pelvic pain if a small functioning uterine remnant is present

Diagnosis

• Physical examination: normal external genitals with a short or absent vagina.
• Pelvic ultrasound and MRI: confirm the absent uterus, look for any uterine remnants, and confirm normal ovaries.
• Hormone tests: normal estrogen, FSH and LH, showing working ovaries.
• Chromosome analysis (karyotype): 46,XX, distinguishing it from conditions such as androgen insensitivity syndrome.
• Kidney ultrasound: checks for a missing or abnormal kidney.
• Spine X-rays: look for vertebral anomalies and scoliosis.
• Hearing tests and sometimes heart assessment.

Treatment and care

Vaginal lengthening

• Vaginal dilator therapy: the first-line approach, using progressively larger dilators to gradually stretch the vaginal tissue, usually started when the person feels ready. It is effective for most people.
• Surgery (vaginoplasty): an option when dilation is not successful or not preferred. Several techniques exist.

Fertility and family building

Because the ovaries work, people with MURCS can have genetically related children through IVF with a gestational carrier (surrogate). Uterus transplantation has resulted in live births and is available in some specialized centers. Adoption is another path.

Kidney care

People with a single kidney should have regular blood pressure checks, urine tests and kidney function tests, and avoid long-term use of NSAIDs where possible. See kidney disease for warning signs.

Spine and hearing

Orthopedic or spine specialist follow-up for vertebral anomalies and scoliosis. People with fused neck vertebrae may be advised to avoid some high-impact contact sports. Hearing aids if hearing loss is present.

Emotional support

The diagnosis can be distressing, particularly at a young age. Counseling, peer support groups and care from a team experienced in MRKH and related conditions are important parts of treatment.

Outlook

MURCS association does not shorten life expectancy when kidney function is preserved. With treatment, most people can have satisfying sexual relationships, and many can become parents through assisted reproduction, surrogacy, uterus transplant or adoption.

Frequently asked questions

What is MURCS association?

MURCS association is a rare congenital condition in which the uterus and upper vagina do not develop, often with a missing kidney and malformed vertebrae in the neck and upper back. The ovaries work normally. It is often considered a severe form of MRKH syndrome.

What are the first signs of MURCS association?

The first sign is usually no periods by about age 15, even though breasts and pubic hair develop normally. Some people notice difficulty using tampons. Neck stiffness from fused vertebrae or a missing kidney found on a scan may also lead to diagnosis.

Can someone with MURCS association have children?

Pregnancy is not possible without a uterus, but because the ovaries are normal, eggs can be retrieved through IVF and carried by a gestational carrier. Uterus transplantation has also led to births in specialized centers. Adoption is another option.

Is MURCS association the same as MRKH syndrome?

They overlap. MRKH syndrome is the absence of the uterus and upper vagina. When it occurs with kidney and cervicothoracic spine anomalies, it is called MURCS association, which is often classified as a severe form of MRKH type 2.