Mayer-Rokitansky-Küster-Hauser syndrome

What it is, symptoms and effects

From: MedlinePlus Genetics, National Library of Medicine

Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome is a disorder that causes the vagina and uterus to be underdeveloped or absent. Because of this, affected women do not have menstrual periods. Often, the first noticeable sign of MRKH syndrome is that menstruation does not begin by age 15 (primary amenorrhea).

Girls and women with MRKH syndrome have a 46,XX chromosome pattern. They have normal external genitalia and functioning ovaries. They also have normal breast and pubic hair development. Women with this condition cannot carry a pregnancy; some may be unable to have biological children (infertile), while others may be able to have children with medical support.

MRKH syndrome is often divided into two types. MRKH syndrome type 1 affects only the reproductive organs. MRKH syndrome type 2 also affects other parts of the body. In this form of the condition, the kidneys may be abnormally formed or positioned, or one kidney may fail to develop (unilateral renal agenesis). Additionally, hearing loss, heart defects, or skeletal abnormalities, particularly of the spinal bones (vertebrae), can occur in those with MRKH syndrome type 2.

Causes and biological mechanisms

From: MedlinePlus Genetics, National Library of Medicine

The cause of MRKH syndrome is unknown. Changes in several genes that are involved in development before birth have been identified in girls and women with MRKH syndrome. However, these genetic changes have been found in only a small number of affected people, and it is unclear whether they actually cause MRKH syndrome. Researchers are working to determine how genetic changes could lead to problems with the development of the female reproductive system.

The features of MRKH syndrome are due to incomplete development of the Müllerian duct. This is a structure in the embryo that develops into the uterus, fallopian tubes, cervix, and the upper part of the vagina. The cause of the incomplete development of the Müllerian duct is unknown. Originally, researchers suspected that MRKH syndrome was caused by environmental factors during pregnancy, such as medication or maternal illness. However, subsequent studies have not identified a clear association between MRKH syndrome and any specific environmental factors. Researchers now suggest that genetic and environmental factors together contribute to the development of MRKH syndrome, although the specific factors are often unknown.

It is also unclear why some girls and women with MRKH syndrome have abnormalities in parts of the body other than the reproductive system. Certain tissues and organs, such as the kidneys, develop from the same embryonic tissue as the Müllerian duct, and researchers suspect that problems during development could affect these organs as well.

Inheritance and family implications

From: MedlinePlus Genetics, National Library of Medicine

Most cases of MRKH syndrome occur in girls and women with no history of the disorder in their family.

Less often, MRKH syndrome is passed through generations in families. Its inheritance pattern is usually unclear because the signs and symptoms of the condition frequently vary among affected girls and women in the same family. However, in some families, the condition appears to have an autosomal dominant pattern of inheritance. Autosomal dominant inheritance means that one copy of an altered gene in each cell is typically sufficient to cause the disorder, although it is often unclear which gene is involved in individual cases of MRKH syndrome.

How common is it?

From: MedlinePlus Genetics, National Library of Medicine

MRKH syndrome affects approximately 1 in 4,500 female newborns.

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Aplasia of the uterus · Very frequent (99-80%)

A congenital defect characterized by absence of the uterus. Aplasia refers to the failure of an organ to develop during embryonic growth and development due to the absence of primordial tissue.

Hypoplasia of the vagina · Very frequent (99-80%)

Developmental hypoplasia of the vagina.

Primary amenorrhea · Very frequent (99-80%)

Abdominal pain · Frequent (79-30%)

An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) and perceived to originate in the abdomen.

Abnormality of the kidney · Frequent (79-30%)

An abnormality of the kidney.

Anxiety · Frequent (79-30%)

Intense feelings of nervousness, tension, or panic often arise in response to interpersonal stresses. There is worry about the negative effects of past unpleasant experiences and future negative possibilities. Individuals may feel fearful, apprehensive, or threatened by uncertainty, and they may also have fears of falling apart or losing control.

Depression · Frequent (79-30%)

Frequently experiencing feelings of being down, miserable, and/or hopeless; struggling to recover from these moods; having a pessimistic outlook on the future; feeling a pervasive sense of shame; having a low self-worth; experiencing thoughts of suicide and engaging in suicidal behavior.

Dyspareunia · Frequent (79-30%)

Recurrent or persistent genital pain associated with sexual intercourse.

Other findings in the same source

From: Orphanet

Additional reported features include Abnormal ear morphology (Occasional (29-5%)); Abnormal form of the vertebral bodies (Occasional (29-5%)); Abnormal sacrum morphology (Occasional (29-5%)); Addictive substance use (Occasional (29-5%)); Aplasia of the ovary (Occasional (29-5%)); Bipolar affective disorder (Occasional (29-5%)); Ectopic kidney (Occasional (29-5%)); Ectopic ovary (Occasional (29-5%)); Endometriosis (Occasional (29-5%)); Horseshoe kidney (Occasional (29-5%)). This is a selected summary, not a complete description of the condition.

Which doctor should you see?

The suggested department for discussing Mayer-Rokitansky-Küster-Hauser syndrome is Clinical Genetics, with a clinical geneticist as the relevant type of clinician. Paediatrician (children) or physician (adults), with clinical geneticist referral.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Does the exact genetic or chromosome finding explain the observed features?
• Would a genetic counsellor help the family understand the result?
• Which organ-specific assessments are appropriate for this particular diagnosis?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Mayer-Rokitansky-Küster-Hauser syndrome. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.