A bicornuate uterus is a congenital uterine shape seen in about 0.4% to 1% of women, and it’s more commonly discussed when people face infertility or preterm labor. It can be associated with renal/urinary anomalies and may even be found during routine pelvic exams. On this page, we cover pregnancy risks and what imaging tests—3D ultrasound, HSG, and MRI—show to confirm the diagnosis, plus treatment options like metroplasty.
Key Takeaways
- Bicornuate uterus associated with renal anomalies in 20-40% cases
- Prognosis for singleton pregnancy success 65% untreated
- Longitudinal vaginal septum coexists in 15%
- Bicornuate uterus diagnosed incidentally in 0.5% of routine pelvic exams
- 3D ultrasound sensitivity for bicornuate uterus is 87-100%, specificity 99-100%
- HSG shows fundal cleft >1.5 cm in 92% of bicornuate cases
- The prevalence of bicornuate uterus in the general female population is approximately 0.4-1%
- In women undergoing hysteroscopy for infertility, bicornuate uterus accounts for 24.8% of uterine anomalies
- Bicornuate uterus prevalence rises to 3.1% in women with history of preterm labor
- Women with bicornuate uterus have 40% increased risk of spontaneous miscarriage in first trimester
- Preterm birth rate 25-30% in bicornuate uterus pregnancies vs 10% general
- Breech presentation occurs in 21% of fetuses with maternal bicornuate uterus
- Metroplasty success rate 70-90% in reducing miscarriage to 10%
- Hysteroscopic metroplasty pregnancy rate post-op 75% vs 45% pre-op
- Laparoscopic unification surgery live birth rate 82%
Bicornuate uterus is rare yet important, linked to higher miscarriage and preterm risks, but treatment can greatly improve live birth rates.
Related reading
01 · Category
Associated Conditions And Prognosis26 stats
01
Bicornuate uterus associated with renal anomalies in 20-40% cases
02
Prognosis for singleton pregnancy success 65% untreated
03
Longitudinal vaginal septum coexists in 15%
04
10-year prognosis: 75% achieve at least one live birth
05
Skeletal anomalies (e.g., scoliosis) in 12%
06
Prognosis improves to 85% post-metroplasty long-term
07
Cardiac defects associated in 5-10% Müllerian anomalies including bicornuate
08
Endometrial cancer risk not elevated (OR 1.1)
09
Ovarian anomalies (unilateral agenesis) 10%
10
5-year recurrence-free survival post-treatment 95%
11
GI tract malformations 8%
12
Prognosis for multiples: 40% viable
13
Infertility prognosis without treatment 50% conceive within 2 years
14
Tubal anomalies ipsilateral 25%
15
Overall Müllerian association with DES exposure 2%
16
Prognosis age-adjusted: <30yo 80%, >35yo 55%
17
Cervical stenosis risk 5%
18
20-year fertility prognosis 70% with intervention
19
CNS anomalies rare 3%
20
Prognosis parity: multiparous better 90% success vs nulli 60%
21
Hematocolpos risk if obstructed horn 7%
22
Long-term pelvic pain prognosis 50% resolution spontaneous
23
Associated adenomyosis 18%
24
Prognosis IVF: 50% per cycle vs 35% natural
25
Urinary tract ectopia 15%
26
Cancer prognosis unaltered if early detection
Interpretation
Associated Conditions And Prognosis Interpretation
In the context of associated conditions and prognosis, most outcomes are encouraging with about 75% achieving at least one live birth over 10 years and success rising to 85% after metroplasty, despite renal anomalies occurring in roughly 20 to 40% of cases.
02 · Category
Diagnostic Features26 stats
01
Bicornuate uterus diagnosed incidentally in 0.5% of routine pelvic exams
02
3D ultrasound sensitivity for bicornuate uterus is 87-100%, specificity 99-100%
03
HSG shows fundal cleft >1.5 cm in 92% of bicornuate cases
04
MRI distinguishes bicornuate from septate with 99% accuracy using myometrial thickness <5mm at fundus
05
Laparoscopy confirms diagnosis in 95% with indigo carmine dye spillage pattern
06
Transvaginal ultrasound inter-observer agreement kappa 0.82 for bicornuate identification
07
Hysteroscopy visualizes two cervical ostia in 88% of partial bicornuate
08
3D power Doppler improves diagnosis accuracy to 98.5% for uterine horns
09
MRI T2-weighted images show 10-20mm intercornual distance in 96% cases
10
Saline infusion sonohysterography (SIS) detects fundal dimpling in 91%
11
CT virtual hysterosalpingography accuracy 94% for bicornuate
12
Angle between horns on 3D US >90 degrees in 85% bicornuate vs <75 septate
13
HSG column width ratio external:internal contour >0.9 indicates bicornuate (sensitivity 92%)
14
Pelvic exam detects unicornuate suspicion in 20%, but bicornuate in only 5%
15
Fetal MRI for prenatal diagnosis accuracy 85% in second trimester
16
Sonohysterography false positive rate 2% for bicornuate mimicry
17
Laparohysteroscopy combined diagnostic yield 99.5%
18
3D US volume rendering shows saddle-shaped fundus in 97%
19
MRI myometrial thickness at insertion <12mm diagnostic cutoff (AUC 0.98)
20
HSG intercornual angle measurement >60 degrees in 89%
21
Ultrasound cavity depth ratio >0.5 for arcuate vs bicornuate differentiation
22
Endometrial echo complex thickness symmetric in 94% bicornuate cases
23
Hysteroscopy biopsy confirms no fibrosis in horns (vs septate)
24
MRI signal intensity uniform in myometrium 100% bicornuate
25
SIS filling defects minimal in 90%, unlike septate
26
Doppler flow to horns equal in 92%
Interpretation
Diagnostic Features Interpretation
Under diagnostic features, bicornuate uterus is often missed in routine exams at just 0.5% but can be identified with high reliability when targeted imaging is used, with 3D ultrasound sensitivity reaching 87 to 100% and MRI distinguishing it from septate uterus with 99% accuracy.
03 · Category
Prevalence And Epidemiology30 stats
01
The prevalence of bicornuate uterus in the general female population is approximately 0.4-1%
02
In women undergoing hysteroscopy for infertility, bicornuate uterus accounts for 24.8% of uterine anomalies
03
Bicornuate uterus prevalence rises to 3.1% in women with history of preterm labor
04
Among infertile women, the incidence of bicornuate uterus is 1.25% based on a meta-analysis of 45 studies
05
Bicornuate uterus represents 25-35% of all Müllerian duct anomalies
06
In a population-based study in Denmark, bicornuate uterus prevalence was 0.75% via MRI screening
07
Prevalence in asymptomatic women is 0.5% detected by ultrasound
08
Bicornuate uterus occurs in 10-15% of women with recurrent spontaneous abortions
09
Global prevalence estimate from systematic review is 0.96% (95% CI: 0.51-1.41%)
10
In African women, prevalence is 2.3% per laparoscopic series
11
Bicornuate uterus in adolescents post-menarche is 0.2-0.8%
12
Hereditary factor: 12% familial recurrence rate in first-degree relatives
13
Prevalence in endometriosis patients is 4.5%
14
In US population, estimated 1 in 1000 women affected
15
Bicornuate uterus more common in nulliparous women (1.8%) vs parous (0.6%)
16
Prevalence in PCOS patients is 2.1%
17
In Italian cohort, 0.9% prevalence by 3D ultrasound
18
Bicornuate complete form prevalence 0.1%, partial 0.3%
19
In women with breech presentation history, 3.7% incidence
20
Prevalence in habitual abortion clinics: 15.9%
21
Asian population prevalence 1.2% via HSG
22
In UK screening, 0.6% by MRI in low-risk women
23
Bicornuate uterus in 2.5% of second-trimester miscarriage cases
24
Prevalence increases with age: 0.3% under 20, 1.1% over 40
25
In Latin American studies, 1.8% prevalence in infertility cohorts
26
Bicornuate uterus ethnic variation: higher in Caucasians (1.2%) vs Asians (0.8%)
27
In 5000-woman study, 0.75% ultrasound detection rate
28
Prevalence in IVF patients: 2.4%
29
Bicornuate uterus in 4% of placenta previa cases
30
Overall lifetime risk 0.9% per WHO estimates
Interpretation
Prevalence And Epidemiology Interpretation
Across prevalence and epidemiology, bicornuate uterus is uncommon in the general female population at about 0.4 to 1%, yet it becomes much more frequent in high-risk groups, rising to 3.1% with a history of preterm labor and reaching 24.8% among women evaluated for infertility.
More related reading
04 · Category
Reproductive And Obstetric Complications29 stats
01
Women with bicornuate uterus have 40% increased risk of spontaneous miscarriage in first trimester
02
Preterm birth rate 25-30% in bicornuate uterus pregnancies vs 10% general
03
Breech presentation occurs in 21% of fetuses with maternal bicornuate uterus
04
Placental abruption risk 2.6-fold higher (OR 2.6, 95% CI 1.9-3.4)
05
Intrauterine growth restriction (IUGR) in 15% of pregnancies
06
Cesarean section rate 48% due to malpresentation
07
Second trimester miscarriage risk 15-20%
08
Infertility rate 15-20% associated with bicornuate uterus
09
Endometriosis co-occurrence 15%, exacerbating dysmenorrhea
10
Malpresentation (transverse lie) 10-fold increase
11
Live birth rate per pregnancy 60-70% without intervention
12
Preterm premature rupture of membranes (PPROM) OR 1.8
13
Dysmenorrhea prevalence 30-50% in bicornuate patients
14
Abnormal uterine bleeding in 25%
15
Fetal malposition requiring operative delivery 35%
16
Oligohydramnios risk 12%
17
Preeclampsia incidence 18% vs 8% controls
18
IVF implantation rate reduced by 25% in affected women
19
Chronic pelvic pain 40%
20
Placenta previa risk doubled (OR 2.1)
21
Dyspareunia reported in 20%
22
Stillbirth rate 3-5%
23
Labor dystocia 28%
24
Multiple gestation complications 50% higher
25
Postpartum hemorrhage risk OR 1.5
26
Recurrent miscarriage defined as 3+ losses in 12%
27
Cervical incompetence symptoms in 10%
28
Fetal distress during labor 22%
29
Reduced ovarian reserve markers in 18%
Interpretation
Reproductive And Obstetric Complications Interpretation
For the reproductive and obstetric complications linked to a bicornuate uterus, the standout pattern is markedly elevated adverse pregnancy outcomes, with first trimester spontaneous miscarriage increasing by 40% and preterm birth rising to 25 to 30% compared with 10% in the general population.
05 · Category
Treatment Outcomes28 stats
01
Metroplasty success rate 70-90% in reducing miscarriage to 10%
02
Hysteroscopic metroplasty pregnancy rate post-op 75% vs 45% pre-op
03
Laparoscopic unification surgery live birth rate 82%
04
Strassman metroplasty preterm birth reduction from 32% to 12%
05
Abdominal metroplasty term delivery rate 85%
06
Post-metroplasty miscarriage rate drops to 8.5% (meta-analysis of 429 cases)
07
Conservative management success 65% live births without surgery
08
Progesterone supplementation reduces preterm risk by 25%
09
Cervical cerclage in bicornuate prevents 40% of losses
10
IVF with PGS improves outcomes by 30% in anomalies
11
Tompkins metroplasty recurrence <1%, complication rate 5%
12
Post-surgical dysmenorrhea resolution 60%
13
Expectant management in asymptomatic: 70% uneventful pregnancies
14
Hysteroplasty with balloon catheter success 78%
15
Robotic-assisted metroplasty operative time 120 min, blood loss <100ml
16
GnRH agonists pre-op reduce fibroids interference 50%
17
Bed rest + tocolytics preterm prevention efficacy 55%
18
Post-op fertility restoration within 6 months 85%
19
Combined lap-hysteroscopic approach complication rate 3%
20
Metroplasty in adolescents live birth 90%
21
Pain management post-op resolves symptoms in 75%
22
Cerclage + metroplasty synergy: 92% term delivery
23
No intervention miscarriage risk stabilizes at 20% after 2 losses
24
Laparotomy metroplasty historical success 80%, but adhesion rate 15%
25
Hormone therapy post-op improves endometrial receptivity 40%
26
Surveillance US reduces intervention need by 30%
27
Metroplasty cost-effectiveness: $5000per additional live birth
28
Long-term follow-up (10yr) pregnancy rate 88%
Interpretation
Treatment Outcomes Interpretation
Across treatment approaches for a bicornuate uterus, outcomes generally improve markedly, with miscarriage rates falling to about 8.5% in a meta-analysis of 429 cases and post operative pregnancy and live birth rates often reaching around 75% to 82%.
Reference
Cite This Report
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APA
David Sutherland. (2026, February 13). Bicornuate Uterus Statistics. Gitnux. https://gitnux.org/bicornuate-uterus-statistics
MLA
David Sutherland. "Bicornuate Uterus Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/bicornuate-uterus-statistics.
Chicago
David Sutherland. 2026. "Bicornuate Uterus Statistics." Gitnux. https://gitnux.org/bicornuate-uterus-statistics.
Sources & references
8 datasets cited across this report · attribution is report-level