What Is an Isthmocele and How Can It Affect Fertility?
What Is an Isthmocele?
An isthmocele (also called a C-section scar defect or niche) is a pouch-like defect or thinning in the lower uterine wall at the site of a prior cesarean section incision.
- It’s essentially a small pocket or indentation where the uterus didn’t fully heal after a C-section.
- It’s usually located in the lower uterine segment, near the cervix.
Why Is It Important?
Many women with an isthmocele have no symptoms, but for some, it can cause:
- Abnormal bleeding after your period ends (“postmenstrual spotting”)
- Pelvic pain or cramping
- And in some cases: secondary infertility
How Can an Isthmocele Cause Infertility?
If you had a successful pregnancy before, but are now having trouble conceiving (called secondary infertility), an isthmocele may play a role by:
|
Issue |
Impact |
|---|---|
|
Fluid accumulation in the scar pouch |
This fluid can leak into the uterus and interfere with embryo implantation |
|
Inflammation or altered blood flow |
Creates a less receptive environment for an embryo |
|
Trapped menstrual blood |
May disrupt the normal uterine lining or lead to chronic inflammation |
|
Impaired sperm transport |
In rare cases, the altered anatomy can affect sperm movement through the uterus |
How Is It Diagnosed?
Your provider may suspect an isthmocele if you have:
- Secondary infertility
- Postmenstrual spotting
- A history of C-section
We typically confirm with:
- Transvaginal ultrasound with saline infusion (SIS) or
- Sonohysterogram
- Sometimes MRI or hysteroscopy if more detail is needed
How Is It Treated?
Treatment depends on your symptoms and fertility goals:
- Hysteroscopic surgery (minimally invasive)
- Removes scar tissue and reshapes the uterine wall
- Can improve implantation rates
- Laparoscopic repair
- Used for larger or deeper defects
- Monitoring only
- If you’re not symptomatic or already pregnant, no action may be needed
Takeaway
An isthmocele is a treatable cause of secondary infertility. If you’ve had a C-section and are now struggling to conceive or experiencing unusual bleeding, it’s worth exploring this possibility with your fertility provider.
Early diagnosis and appropriate treatment can improve your chances of a successful pregnancy.
