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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 shape

External contour

Class U0: normal uterus

Straight, curved interostial line or internal indentation < 50% myometrial thickness

Normal outline or external cleft < 50% of uterine wall thickness

Class U1: dysmorphic uterus

Abnormal

Normal outline or external cleft < 50% of uterine wall thickness

 a. T-shaped

Narrow cavity; thickened lateral walls; correlation of two-third uterine corpus and one-third cervix

 

 b. Infantilis

Narrow cavity without wall thickening; correlation of one-third uterine body and two-third cervix

 

 c. Others

Internal indentation < 50% myometrial thickness

 

Class U2: septate uterus

Internal indentation > 50% myometrial thickness

Normal outline or external cleft < 50% of uterine wall thickness

 a. Partial

a. Division above of the internal cervical os

 

 b. Complete

b. Division up to the internal cervical os

 

Class U3: bicorporeal uterus

 

External cleft > 50% myometrial thickness

 a. Partial

Division above of the internal cervical os

Division above the cervix

 b. Complete

Division up to the internal cervical os

Division up to the cervix

 c. Bicorporeal septate

Midline fundal indentation (myometrial thickness at the central point of the external cleft) > 150% uterine wall thickness (average myometrial thickness

 

Class U4: hemi-uterus

Unilateral formed cavity

Unilateral formed corpus

 a. With a rudimentary (functional) cavity

With communicating or non-communicating functional contralateral horn of cavity

 

 b. Without rudimentary (functional) cavity

Without functional contralateral horn of cavity

 

Class U5: aplastic uterus

  

 a. With rudimentary (functional) cavity

Cavity remnant/s present

Cavity remnant/s present

 b. Without rudimentary (functional) cavity

Cavity remnants absent

Full uterine aplasia or uterine remnants present

Class U6: unclassified cases

 

Infrequent anomalies, subtle changes, or combined anomalies