Four types of<unk> s The American Fertility Society (now American Society of Reproductive Medicine) Classification distinguishes: ; Class I—Müllerian agenesis (absent uterus). : This condition is represented by the hypoplasia or the agenesis (total absence) of the different parts of the uterus: :* Vaginal hypoplasia or agenesis :* Cervical hypoplasia or agenesis :* Fundal hypoplasia or agenesis (absence or hypoplasia of the fundus of the uterus) :* Tubal hypoplasia or agenesis (absence or hypoplasia of the Fallopian tubes) :* Combined hypoplasia the agenesis of different part of the uterus :This condition is also called Mayer-Rokitansky-Kuster-Hauser syndrome. The patient with MRKH syndrome will have primary amenorrhea. ; Class II—Unicornuate uterus (a one-sided uterus). : Rare condition in which a partial or complete lack of one Müllerian duct is present. The uterus has a typical "banana shape" on imaging systems. This condition can be sub-classified in: :* Communicating: a rudimentary<unk>  horn is formed and it presents a cavity that communicates with the body of the uterus :* Non-communicating: a rudimentary<unk>  horn is formed and it presents a cavity that does not communicate with the body of the uterus :* No cavity: a rudimentary<unk>  horn is present without any cavity :* No horn: there is no rudimentary<unk>  horn, just the functioning one is present ; Class III—Uterus didelphys, also uterus didelphis (double uterus). : Both Müllerian ducts develop but fail to fuse, thus the patient has a "double uterus". This may be a condition with a double cervix and a vaginal partition (v.i.), or the lower Müllerian system fused into its unpaired condition. See Triplet-birth with Uterus didelphys for a case of a woman having spontaneous birth in both wombs with twins. ; Class IV—Bicornuate uterus (uterus with two horns). : Only the upper part of that part of the Müllerian system that forms the uterus fails to fuse, thus the caudal part of the uterus is normal, the cranial part is bifurcated. The uterus is "heart-shaped". This condition can be complete or partial. ; Class V—Septated uterus<unk>  septum or partition). : The two Müllerian ducts have fused, but the partition between them is still present, splitting the system into two parts. With a complete septum the vagina, cervix and the uterus can be partitioned. Usually the septum affects only the cranial part of the uterus. A<unk>  septum is the most common<unk>  and a cause for miscarriages. It is diagnosed by medical image techniques, i.e. ultrasound or an MRI. MRI is considered the preferred modality due to its multiplanar capabilities as well as its ability to evaluate the<unk>  contour, junctional zone, and other pelvic anatomy. A hysterosalpingogram is not considered as useful due to the inability of the technique to evaluate the exterior contour of the uterus and distinguish between a bicornuate and septate uterus. This condition can be complete or partial :A<unk>  septum can be corrected by hysteroscopic surgery. ; Class VI—DES uterus.Hysterosalpingography of a T shaped uterus : The<unk>  cavity has a "T-shape" as a result of fetal exposure to diethylstilbestrol. An additional variation is the arcuate uterus where there is a concave dimple in the<unk>  fundus within the cavity. The distinction between an arcuate uterus and a septate uterus is not standardized. A rudimentary uterus is a<unk>  remnant not connected to cervix and vagina and may be found on the other side of a unicornuate uterus. Patients with<unk>  abnormalities may have associated renal abnormalities including unilateral renal agenesis. "Double vagina" As the vagina is largely derived from the Müllerian ducts, lack of fusion of the two ducts can lead to the formation of a vaginal duplication and lack of absorption of the wall between the two ducts will leave a residual septum, leading to a "double vagina". This condition may be associated with a uterus didelphys or a<unk>  septum.
Uterine malformation
Mullerian anomalies
Placental disease
Retained placenta
Uterine incarceration
Uterine hypoplasia
Obstetrical bleeding
Embryo loss