Yes, ectopic pregnancy can occur even after both fallopian tubes have been surgically removed. It is rare, but it happens because a fertilized egg can implant in several locations that exist independently of the tubes. Understanding where and how this occurs is especially important if you’ve had a bilateral salpingectomy and are trying to conceive through IVF, or if you experience unexpected pregnancy symptoms.
How Pregnancy Occurs Without Tubes
When both fallopian tubes are removed (bilateral salpingectomy), the usual pathway for an egg to travel from the ovary to the uterus no longer exists. But fertilization and implantation can still happen through a few alternative routes. A released egg can drift into the open space of the pelvic cavity, where it may encounter sperm that traveled through the uterus. From there, the fertilized egg can attach to nearby tissue rather than reaching the uterine lining.
Researchers have identified several mechanisms that explain this. Retrograde migration allows a fertilized egg to travel through the pelvic cavity and attach to structures like the round ligament or ovary. Micro-fistulas, tiny channels that form in the healing tissue after surgery, can create an unexpected pathway between the uterine cavity and the pelvic space. In IVF specifically, an embryo placed directly into the uterus during transfer can migrate upward toward the uterine corners or even pass through a small perforation created during the procedure.
Where Ectopic Implantation Happens
Without fallopian tubes, ectopic pregnancies tend to occur at a handful of specific sites:
- Interstitial (cornual): The short segment of the tube that passes through the uterine wall often remains after salpingectomy. This is one of the most common non-tubal ectopic locations and one of the most dangerous.
- Ovarian: The fertilized egg implants on or within the ovary itself.
- Abdominal: Implantation occurs on a surface inside the abdominal cavity, such as the bowel, liver, or the lining of the pelvis.
- Cervical: The embryo attaches in the cervix instead of the uterine cavity.
- Cesarean scar: In women with a prior C-section, the embryo can implant in the scar tissue on the lower uterine wall.
- Tubal stump: If a small remnant of tube remains after surgery, implantation can occur there. This has been reported with a prevalence of roughly 0.4% after tube removal.
Why Interstitial Ectopics Are Especially Dangerous
The interstitial portion of the fallopian tube sits within the thick muscular wall of the uterus. Because of this surrounding muscle, an interstitial pregnancy can grow longer than a typical tubal ectopic before causing symptoms, sometimes reaching 12 weeks or beyond. That extra time is what makes it so risky. The area has a rich blood supply fed by connections between the uterine and ovarian arteries, so when rupture occurs, bleeding can be massive and life-threatening.
Interstitial ectopics carry a mortality rate of 2 to 5%, and roughly 15% of them rupture. Most ruptures happen before 12 weeks, though cases have been documented as late as 17 weeks. About 40% of all deaths from ectopic pregnancies are caused by cornual or interstitial rupture. These numbers make early detection critical.
IVF Raises the Risk
If you’ve had your tubes removed and are pursuing pregnancy through IVF, ectopic pregnancy remains a real possibility. The incidence of ectopic pregnancy after IVF embryo transfer ranges from about 3% to nearly 9%, which is notably higher than after natural conception. This may seem counterintuitive since the embryo is placed directly into the uterus, but embryos are mobile in the hours after transfer and can drift toward the uterine corners or other abnormal sites.
One factor that increases this risk is a thin uterine lining at the time of embryo transfer. A thinner lining pushes the embryo closer to areas with higher oxygen concentrations, which can actually inhibit normal implantation and drive the embryo toward lower-oxygen locations outside the uterine cavity. This is one reason fertility specialists carefully monitor endometrial thickness before proceeding with a transfer.
How It’s Detected
Ectopic pregnancy after tube removal is diagnosed the same way as other ectopics, but it requires a high index of suspicion because many people assume they’re “safe” from ectopic pregnancy once their tubes are gone. Transvaginal ultrasound is the primary tool. For interstitial pregnancies, doctors look for a specific set of findings: an empty uterine cavity, a gestational sac sitting off to one side more than 1 cm from the lateral uterine wall, and a thin layer of uterine muscle (less than 5 mm) surrounding the sac. A characteristic “interstitial line sign,” a visible line extending from the uterine horn toward the sac, can help confirm the diagnosis.
Blood hormone levels also play a role. If your pregnancy hormone is rising but an ultrasound shows no pregnancy inside the uterus, your provider will investigate ectopic locations. The challenge with non-tubal ectopics is that hormone levels can sometimes follow patterns that look more like a normal pregnancy, delaying diagnosis.
Treatment Options
Treatment depends on where the ectopic is located, how far along it is, and whether rupture has occurred. For early, unruptured ectopics, medication that stops the pregnancy from growing is often the first approach. This is given as an injection and requires follow-up blood work over several weeks to confirm hormone levels are declining.
When medication isn’t appropriate or the ectopic has ruptured, surgery is necessary. Interstitial and cornual ectopics have traditionally required open abdominal surgery with removal of the affected uterine corner (wedge resection) or, in severe cases, removal of the uterus entirely. Minimally invasive laparoscopic techniques have become increasingly available for these cases, offering shorter recovery times while preserving the uterus for those who want future pregnancies. The specific approach depends on how much bleeding has occurred and how stable you are at the time of treatment.
What to Watch For
If you’ve had both tubes removed and experience a positive pregnancy test, especially after IVF, don’t assume the pregnancy is automatically in the right place. Early ultrasound confirmation of an intrauterine pregnancy is important. Symptoms that suggest an ectopic include one-sided pelvic pain, vaginal bleeding that differs from a normal period, shoulder tip pain (which can signal internal bleeding irritating the diaphragm), and dizziness or lightheadedness. These symptoms can develop gradually or appear suddenly if rupture occurs.
The key takeaway is that removing the fallopian tubes dramatically reduces ectopic risk but does not eliminate it. Staying aware of the possibility, particularly during IVF cycles, allows for earlier diagnosis and safer outcomes.