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Table 1 Ultrasound criteria for the classification of congenital uterine anomalies by ESHRE–ESGE [5]

From: Role of three-dimensional transvaginal sonography compared with magnetic resonance imaging in diagnosis of Mullerian duct anomalies

 Uterine cavity shapeExternal contour
Class U0: normal uterusStraight, curved interostial line or internal indentation < 50% myometrial thicknessNormal outline or external cleft < 50% of uterine wall thickness
Class U1: dysmorphic uterusAbnormalNormal outline or external cleft < 50% of uterine wall thickness
 a. T-shapedNarrow cavity; thickened lateral walls; correlation of two-third uterine corpus and one-third cervix 
 b. InfantilisNarrow cavity without wall thickening; correlation of one-third uterine body and two-third cervix 
 c. OthersInternal indentation < 50% myometrial thickness 
Class U2: septate uterusInternal indentation > 50% myometrial thicknessNormal outline or external cleft < 50% of uterine wall thickness
 a. Partiala. Division above of the internal cervical os 
 b. Completeb. Division up to the internal cervical os 
Class U3: bicorporeal uterus External cleft > 50% myometrial thickness
 a. PartialDivision above of the internal cervical osDivision above the cervix
 b. CompleteDivision up to the internal cervical osDivision up to the cervix
 c. Bicorporeal septateMidline fundal indentation (myometrial thickness at the central point of the external cleft) > 150% uterine wall thickness (average myometrial thickness 
Class U4: hemi-uterusUnilateral formed cavityUnilateral formed corpus
 a. With a rudimentary (functional) cavityWith communicating or non-communicating functional contralateral horn of cavity 
 b. Without rudimentary (functional) cavityWithout functional contralateral horn of cavity 
Class U5: aplastic uterus  
 a. With rudimentary (functional) cavityCavity remnant/s presentCavity remnant/s present
 b. Without rudimentary (functional) cavityCavity remnants absentFull uterine aplasia or uterine remnants present
Class U6: unclassified cases Infrequent anomalies, subtle changes, or combined anomalies