Classification System of the American Fertility Society (AFS) for Muellerian Duct Abnormalities

Class

Term

Features

Ia

hypoplasia/agenesis, vaginal

affects vagina

Ib

hypoplasia/agenesis, cervical

affects cervix

Ic

hypoplasia/agenesis, fundal

affects fundus

Id

hypoplasia/agenesis, tubal

affects fallopian tubes

Ie

hypoplasia/agenesis, combined

affects more than 1 of the above

IIa

unicornuate, communicating

one Muellerian duct normal and one a small remnant with an endometrial cavity that does communicate with the normal side

IIb

unicornuate, non-communicating

one Muellerian duct normal and one a small remnant with an endometrial cavity that does not communicate with the normal side

IIc

unicornuate, no cavity

one Muellerian duct normal and one a small remnant with no endometrial cavity

IId

unicornuate. no horn

one Muellerian duct normal and one completely absent

III

didelphus

2 separate cervices and endometrial cavities without fusion of the separating walls

IVa

bicornuate, complete

single cervix but mid and upper uterus separate

IVb

bicornuate, partial

single cervix with upper uterus separate

Va

septate, complete

single cervix, membrane arising from the fundus completely separating 2 endometrial cavities

Vb

septate, partial

single cervix, membrane arising from the fundus partially separating an endometrial cavity

VI

arcuate

minor septum remnant in the fundus

VII

DES-related