Müllerian duct anomaly classification

The Müllerian duct anomaly classification is a seven point system that can be used to describe a number of embryonic Müllerian duct anomalies:

  • class I: uterine agenesis / uterine hypoplasia
    • a: vaginal (uterus: normal / variety of abnormal forms)
    • b: cervical
    • c: fundal
    • d: tubal
    • e: combined
  • class II: unicornuate uterus/unicornis unicollis, ~15% (range 6-25%)
    • a: communicating contralateral rudimentary horn contains endometrium
    • b: non-communicating contralateral rudimentary horn contains endometrium
    • c: contralateral horn has no endometrial cavity
    • d: no horn
  • class III: uterus didelphys, ~7.5% (range 5-11%)
  • class IV: bicornuate uterus: next commonest type, ~25% (range 10-39%)
    • a: complete division, all the way down to the internal os (bicornuate bicollis)
    • b: partial division, not extending to the internal os (bicornuate unicollis)
  • class V: septate uterus: commonest anomaly, ~45% (range 34-55%)
    • a: complete division, all the way down to internal the os
    • b: incomplete division
  • class VI: arcuate uterus, ~7%
  • class VII: in utero diethylstilbestrol (DES) exposure (T-shaped uterus)

See also

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Article information

rID: 6322
System: Gynaecology
Tag: uterus
Synonyms or Alternate Spellings:
  • Müllerian duct anomaly classification (AFS classification)
  • Classification of Mullerian duct anomalies

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Cases and figures

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    Sagittal T2 MRI p...
    Class I: uterine agenesis (MRK)
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    Class III: uterus didelphys
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    Class III: uterus didelphys
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    Axial T2 pelvis

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    Class IV: bicornuate uterus
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    Class V: septate uretus
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    Cor T2 00
    Class VI: arcuate uterus
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    Class VII: T-shaped uterus
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