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Müllerian Anomalies — Advanced Classification

ESHRE/ESGE and ASRM Classification Systems

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Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Kadın Hastalıkları ve Doğum department. Book Appointment →

What is Müllerian Anomalies — Advanced Classification?

Müllerian duct anomalies are congenital malformations of the uterus, cervix, fallopian tubes, and upper vagina derived from paramesonephric (Müllerian) duct development.

Embryology: paired Müllerian ducts develop at 6 weeks gestation, fuse in midline by 10-12 weeks, with septum resorption complete by 20 weeks.

Prevalence: 1-5% of general population; 5-10% of recurrent miscarriage; 25% of women with combined recurrent loss and preterm birth.

ESHRE/ESGE classification (2013, updated 2021): Uterus (U0 normal, U1 dysmorphic, U2 septate, U3 bicorporeal, U4 hemi-uterus, U5 aplastic, U6 unclassified); Cervix (C0-C4); Vagina (V0-V4).

ASRM classification (1988, revised 2021): Class I (hypoplasia/agenesis), II (unicornuate), III (didelphys), IV (bicornuate), V (septate), VI (arcuate), VII (DES-related).

Embryologic categories: developmental failure (aplasia, hypoplasia), fusion failure (didelphys, bicornuate), septum resorption failure (septate, partial septate).

Symptoms

Asymptomatic in many cases (incidental imaging finding).
Primary amenorrhea (Müllerian agenesis or MRKH syndrome).
Cyclic pelvic pain in obstructive anomalies (OHVIRA, hematocolpos).
Recurrent miscarriage (especially septate, didelphys).
Preterm birth and cervical insufficiency.
Malpresentation, breech, transverse lie.
Infertility.
Dyspareunia (vaginal septum).
Endometriosis association (retrograde menstruation in obstructive anomalies).

Risk Factors

Family history of Müllerian anomalies (rare; mostly sporadic).
Maternal exposure to teratogens during early pregnancy (rare).
Diethylstilbestrol (DES) exposure in utero (T-shaped uterus).
Genetic syndromes: MRKH (uterovaginal aplasia), Bardet-Biedl, McKusick-Kaufman.
Renal anomalies (50% of unicornuate uterus, 25% of didelphys, 10% of septate).
Skeletal anomalies (15% have associated vertebral or limb defects).

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Primary amenorrhea evaluation in adolescent.
  • Cyclic pelvic pain in young woman with normal external genitalia.
  • Recurrent miscarriage (2 or more first-trimester losses).
  • Preterm birth or recurrent pregnancy loss in second trimester.
  • Renal anomaly diagnosis prompting Müllerian screening.
  • Pelvic mass in adolescent (consider hematocolpos in obstructive variant).
  • Infertility with normal hormone profile and partner evaluation.

Treatment Methods

01
Diagnostic workup: clinical exam, transvaginal 3D ultrasound (first-line for diagnosis), MRI pelvis (gold standard for complex anomalies), saline-infusion sonography for cavity assessment.
02
Renal imaging (ultrasound, MRI) mandatory due to high association.
03
Hysterosalpingography for tubal patency in fertility evaluation.
04
Hysteroscopy + laparoscopy: traditional combination for full anatomic assessment.
05
Treatment by anomaly type:
06
U2 (septate): hysteroscopic septum resection (gold standard; improves fertility outcomes).
07
U3 (bicorporeal/bicornuate): generally no intervention; Strassmann metroplasty rarely indicated.
08
U4 (hemi-uterus/unicornuate): rudimentary horn resection if functional endometrium with hematometra.
09
U5 (aplastic): vaginal creation (McIndoe, Vecchietti, Davidov procedures); uterine transplantation experimental.
10
OHVIRA (didelphys + obstructed hemivagina + ipsilateral renal agenesis): urgent vaginal septum resection.
11
Vaginal septum: transvaginal resection.
12
Cervical anomalies: case-by-case (often complex, fertility-preservation focus).
13
Pregnancy management: serial ultrasound, cervical length screening, planned delivery, multidisciplinary team.
14
Genetic counseling for family planning, particularly important if syndromic association.
15
Long-term follow-up: pelvic examination, screening for endometrial pathology, fertility planning.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.