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Health condition · Clinically reviewed

Double uterus, Müllerian anomalies and what they mean for you.

A congenital difference in uterine shape is more common than most people think, and usually far less alarming than it sounds. Here is what it changes, and what it does not.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a UK gynaecologist before publication.

  • 02

    Sourced from guidance

    Checked against RCOG, ESHRE and ASRM classifications you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including hysteroscopic metroplasty and specialist MRKH pathways.

Key facts

Uterine anomalies at a glance.

The essentials, in plain English. What a Müllerian anomaly is, the main types, and what it changes for periods, fertility and pregnancy.

  • What it is

    A congenital difference in uterine development, from failed fusion of the Müllerian (paramesonephric) ducts in early pregnancy.

  • How common

    Around 5 percent of women have some Müllerian anomaly, though major anomalies affect only 1 to 2 percent.

  • Main types

    Didelphys, bicornuate, septate, arcuate, unicornuate, and agenesis or hypoplasia (MRKH syndrome).

  • Often silent

    Many uterine anomalies are found incidentally on scans, and cause no symptoms at all.

  • Fertility

    Most people conceive naturally, though some anomalies increase miscarriage, preterm birth and malpresentation risk.

  • Renal association

    Roughly 30 percent of unicornuate and didelphys anomalies coexist with a kidney anomaly, so a renal scan is standard.

Why this guide matters

The label matters less than the plan.

The words didelphys, bicornuate and septate sound similar, but they mean very different things for treatment. The three points below shape everything else on this page.

  • Not all anomalies need surgery

    Most Müllerian anomalies do not need any treatment at all. Reassurance and information often are the treatment.

  • The septate uterus is the exception

    A uterine septum is the anomaly most strongly linked to miscarriage, and the one most reliably fixed with keyhole surgery.

  • Pregnancy care can be planned

    Where there is real risk, specialist obstetric care with cervical monitoring and a delivery plan changes outcomes.

How the diagnosis is made

From first scan to a precise diagnosis.

The steps a UK gynaecologist normally follows, in order, so you know what to expect and why.

  1. 01

    Assessing

    History and examination

    Periods, pain, obstetric history and any known renal anomaly, followed by a gentle pelvic examination where appropriate.

  2. 02

    Assessing

    Pelvic ultrasound

    A first-line scan that can suggest a uterine anomaly, often the first clue in an asymptomatic woman.

  3. 03

    Assessing

    3D ultrasound

    Three-dimensional imaging gives an accurate reconstruction of the uterine outline and is excellent for classification.

  4. 04

    Confirming

    Pelvic MRI

    The gold standard for detailed anatomy, especially when planning surgery or when the diagnosis is uncertain.

  5. 05

    Confirming

    Hysterosalpingography (HSG)

    Contrast X-ray outlining the uterine cavity and tubes, often used alongside ultrasound in a fertility workup.

  6. 06

    Confirming

    Hysteroscopy and laparoscopy

    Combined direct inspection reserved for complex or surgically relevant cases, or where imaging is inconclusive.

  7. 07

    Screening

    Renal ultrasound

    A kidney scan is offered because renal tract anomalies are common companions, especially in unicornuate and didelphys uteri.

Typical timeline: from first scan to a full picture within a few weeks.

Symptoms

How Müllerian anomalies actually present.

Often silent, sometimes painful, occasionally an obstetric issue only. And a small number of features that need urgent gynaecology.

  • Often no symptoms

    Many anomalies are silent and picked up on a scan done for another reason - reassurance is often all that is needed.

  • Painful periods

    Dysmenorrhoea is common, particularly with obstructed variants or where a rudimentary horn is present.

  • Painful sex

    Dyspareunia can occur where a vaginal septum or obstructed hemivagina alters anatomy.

  • Cyclical pelvic pain

    Trapped menstrual blood in a non-communicating horn (haematometra) or vagina (haematocolpos) causes rising monthly pain.

  • Recurrent miscarriage

    Septate uteri especially raise the risk of first and second trimester loss - a treatable cause of recurrent miscarriage.

  • Preterm birth and malpresentation

    Uterine cavities of altered shape are associated with earlier delivery and higher rates of breech or transverse lie.

  • Primary amenorrhoea

    Absent periods in a teenager with normal external development is the classic presentation of MRKH syndrome.

  • Red flag - acute obstruction

    Severe cyclical pain in a young woman with normal external anatomy can mean an obstructed hemivagina needing urgent gynaecology.

Treatment

How Müllerian anomalies are treated in the UK.

From watchful reassurance to hysteroscopic metroplasty, and the specialist MRKH pathway. Care is coordinated by a gynaecology-led MDT.

  • Watchful reassurance

    For incidental, asymptomatic anomalies with no fertility or obstetric issue - no surgery, just clear information.

  • Hysteroscopic metroplasty

    Keyhole division of a uterine septum through the cervix - the standard fix for a septate uterus causing miscarriage or infertility.

  • Vaginal septum resection

    Surgical removal of an obstructing vaginal septum in didelphys with haematocolpos - relieves pain and restores drainage.

  • Laparoscopic horn excision

    For a unicornuate uterus with a functional but non-communicating rudimentary horn - prevents haematometra and ectopic pregnancy in the horn.

  • Bicornuate - conservative care

    Usually no surgery. Metroplasty is reserved for very selected cases after recurrent loss, in specialist hands.

  • MRKH pathway

    A specialist commissioned service. Counselling, vaginal dilators first line, then Vecchietti, McIndoe or Davydov neovagina if needed.

  • Preconception counselling

    A dedicated conversation about miscarriage, preterm and mode of delivery, before pregnancy - so you know what to expect.

  • Specialist obstetric care

    Serial cervical length scans, selective cerclage, planned delivery and often planned caesarean in complex anomalies.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or gynaecologist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • RCOG (Royal College of Obstetricians and Gynaecologists). Green-top and scientific guidance on congenital uterine anomalies.

  • ESHRE / ESGE. Consensus classification of female genital tract congenital anomalies.

  • ASRM. Müllerian anomalies classification (revised).

  • NICE. Fertility problems: assessment and treatment (CG156) and ectopic pregnancy and miscarriage (NG126).

  • BSGE. Standards for hysteroscopic surgery, including metroplasty.

Red flags

When a Müllerian anomaly needs urgent attention.

Most anomalies are managed calmly in an outpatient setting. These are the situations that need faster review.

  • Acute obstruction and haematocolpos

    Severe cyclical pain with a pelvic mass in a young woman - urgent gynaecology assessment for an obstructed hemivagina or non-communicating horn.

  • Pregnancy in a rudimentary horn

    A pregnancy implanted in a non-communicating unicornuate horn is a surgical emergency with a high rupture risk - specialist care immediately.

  • Recurrent miscarriage

    Three or more first-trimester losses, or one second-trimester loss, deserve investigation for a treatable uterine anomaly.

  • Suspected renal anomaly

    Around 30 percent of unicornuate and didelphys uteri coexist with an absent or ectopic kidney - a renal ultrasound is part of the workup.

  • Primary amenorrhoea

    Absent periods in a young woman with otherwise normal development needs specialist review to consider MRKH or an obstructive cause.

  • Preterm labour risk

    Prior preterm birth in an anomalous uterus warrants serial cervical length monitoring and a selective cerclage discussion.

  • Psychological distress after diagnosis

    Congenital anomalies, and MRKH in particular, carry a real emotional burden - specialist psychological support should be offered.

  • Complex sexual and vaginal anatomy

    Where a vaginal septum or hypoplasia affects sex or tampon use, an experienced reproductive surgeon should lead care.

Living with it

A difference in anatomy, not a life sentence.

Four things that make the biggest practical difference: knowing your anatomy, preconception planning, peer support and specialist review when it matters.

A quiet reminder

Information really is care.

Understanding your own anatomy, and knowing what is and is not a risk, is often the most powerful thing that changes here.

  1. 01 Information

    Know your exact anatomy

    The label matters less than the actual shape of your uterus. Ask for your imaging report and, if possible, a copy of the pictures.

  2. 02 Planning

    Preconception counselling

    A single dedicated conversation before pregnancy usually changes the whole trajectory - risks, monitoring, delivery, and what to look out for.

  3. 03 Support

    You are not alone

    UK charities for Müllerian anomalies and for MRKH offer peer support and information written by women who have lived through it.

  4. 04 Escalate

    Ask for a specialist

    For complex anatomy, recurrent loss, or MRKH, a regional specialist Müllerian anomalies clinic makes a real difference.

Frequently asked

Everything we get asked about double uterus and Müllerian anomalies.

Quick answers on fertility, pregnancy risk, surgery and MRKH.

  • What is a double uterus?

    A double uterus, or uterus didelphys, is a congenital difference where the two Müllerian ducts have not fused, leaving two separate uterine cavities. There are often two cervices, and sometimes a longitudinal vaginal septum as well. It is one of several Müllerian duct anomalies, which include bicornuate, septate, unicornuate, arcuate and agenesis or hypoplasia (MRKH).

  • Can I still get pregnant?

    Yes, most women with a uterine anomaly conceive without difficulty. Pregnancy outcomes depend on the specific anomaly. Septate uterus is most strongly linked to miscarriage and often benefits from surgery. Bicornuate, didelphys and unicornuate uteri carry a higher risk of preterm birth and malpresentation, so specialist obstetric care is important.

  • Do I need surgery?

    Not usually. Incidental anomalies without symptoms need no treatment. Surgery is offered for specific reasons: a septate uterus causing recurrent miscarriage or infertility (hysteroscopic metroplasty), an obstructing vaginal septum in didelphys, or a functional non-communicating rudimentary horn in a unicornuate uterus. Bicornuate uteri are rarely operated on.

  • Why do I need a kidney scan?

    The uterus and kidneys develop from adjacent embryological structures, so anomalies often travel together. Around 30 percent of women with a unicornuate or didelphys uterus have an absent or ectopic kidney. A renal ultrasound is a simple, one-off check that gives useful lifelong information.

  • What is MRKH syndrome?

    Mayer-Rokitansky-Küster-Hauser syndrome is congenital absence or severe underdevelopment of the uterus and upper vagina, with normal ovaries and normal external genitalia. It typically presents as primary amenorrhoea in a teenager with otherwise normal development. Care is delivered in a specialist commissioned NHS centre, with vaginal dilators first line and neovagina surgery if needed.

  • Will my pregnancy be delivered by caesarean?

    Not always, but planned caesarean is common with complex anomalies such as didelphys or unicornuate uteri, particularly when the baby is not head-down. Bicornuate uteri and post-metroplasty septate uteri are often delivered vaginally. The decision is individualised in a specialist obstetric clinic, taking your anatomy, past deliveries and preferences into account.

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