Microscopic Endometriosis Explained | PRM
Microscopic endometriosis can't be seen during surgery but is confirmed when tissue is sent to pathology. It can be missed if it's early, suppressed by hormones or was previously ablated. A "negative" surgery lowers the chances of endo but isn't always the final answer, especially if no samples were taken. Excision removes endometriosis and provides tissue to confirm the diagnosis; ablation burns it and leaves it behind.
Our Dallas endometriosis excision surgeon explains microscopic endometriosis and why "we didn't see anything" isn't always the final answer.
You’ve had the symptoms for years. Painful periods. Pain that flares with your cycle. Maybe bloating, bladder symptoms or pain with sex. You finally had surgery to find out what’s going on, and you were told: “We didn’t see any endometriosis.”
If that’s happened to you, you’re not alone, and it may not be the whole story.
In a recent live conversation, one of our endometriosis excision surgeons in Dallas explained microscopic endometriosis, why it can be missed and what patients should know if their symptoms still don’t add up.
During surgery for endometriosis, a surgeon inspects the pelvis and abdomen for what’s often called “textbook” endometriosis: dark “gunpowder” lesions, red or brown lesions, inflammation and scarring.
Microscopic endometriosis is different. To the eye, everything may look normal, or there may only be small white spots or a bit of scarring that doesn’t look like classic endo. But when tissue from the areas where endometriosis is most common, like the pelvic sidewalls, is sent to pathology, the lab confirms endometriosis is there.
In other words, it wasn’t visible during surgery, but it showed up under the microscope.
There are a few reasons endometriosis may not look obvious during surgery:
This is one reason our surgeons routinely take samples during surgery, even when nothing looks obvious. If both the inspection and pathology come back negative, patients get a more complete answer. If pathology comes back positive, they finally have one.
If you were told you don’t have endometriosis but your symptoms keep fluctuating with your cycle, trust your gut.
A negative surgery does lower the chances that endometriosis is present, but it doesn’t always close the door. Two questions matter:
If the answer to either is unclear, it may be worth talking with an endometriosis specialist about next steps.
There are two main ways endometriosis is treated surgically:
Excision is associated with better symptom improvement, lower recurrence and longer stretches before symptoms return if they do. It also gives the surgeon tissue to send to pathology, which confirms whether what was seen is actually endometriosis.
Finding microscopic endometriosis takes teamwork. The surgeon needs to sample the right areas and take a large enough sample. The pathology team needs to know endometriosis well and examine the tissue thoroughly, with multiple deeper cuts, not just a quick look.
At PRM, our surgeons work closely with pathologists who specialize in endometriosis and related conditions, so patients get a thorough answer.
Microscopic endometriosis is considered superficial, so at most it falls under stage 1. But stage and pain don’t always match. Someone with stage 1 endometriosis can have severe pain, and someone with stage 4 may have very few symptoms.
A lower stage doesn’t make your symptoms any less real. Wondering whether a hysterectomy cures endo, or whether to do IVF or surgery first? Read our follow-up.
A missed diagnosis is hard. A wrong answer can be just as hard, because it can send you down paths that don’t lead to relief. If your symptoms still don’t add up, you deserve a thorough evaluation.
At PRM, our multidisciplinary team specializes in endometriosis, chronic pelvic pain and pelvic floor dysfunction. We hear you. We see you. We believe you.
This article is for educational purposes only and is not medical advice. Talk to your provider about your symptoms and care.
Microscopic endometriosis is endometriosis that isn’t visible during surgery but is confirmed when tissue samples are examined by pathology.
Yes. Endometriosis can look normal or non-specific during surgery, especially if it’s early, being suppressed by hormonal treatment or was previously ablated. Sampling and pathology help confirm whether it’s present.
Excision cuts out and removes endometriosis. Ablation burns the lesion and leaves it behind. Excision also provides tissue that pathology can use to confirm the diagnosis.
