The short answer
An adnexal mass is a lump near the uterus, usually in an ovary or fallopian tube. The phrase names a place, not a cause. Most in people who still have periods are functional cysts that clear within weeks. The described features, your age, and menopause decide what happens next.
Adnexa means the ovaries, fallopian tubes, and nearby tissue, so the phrase names a location.
NCI's list of adnexal masses runs from ovarian cysts to ectopic pregnancy to benign and cancerous tumors.
Functional cysts often clear on their own within 8 to 12 weeks, which is why a repeat scan is a common next step.
A raised CA-125 does not mean cancer, and a normal one does not rule it out.
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The full explanation.
What the word adnexa actually covers
The adnexa are the structures beside the uterus. That means the ovaries, the fallopian tubes, and the tissue that holds them in place.
NCI defines an adnexal mass as a lump in tissue near the uterus, usually in the ovary or fallopian tube. Its own list of examples runs from ovarian cysts, to ectopic pregnancy, to benign and cancerous tumors.
So the phrase names a place. It does not name a cause. That is the whole reason it feels so vague.
The features matter far more than the phrase
A radiologist writes "adnexal mass" and then describes what it looks like. The description is the part that carries meaning.
Read the sentences around the phrase. Look for:
- the size, usually in centimeters.
- words like simple, thin-walled or anechoic.
- words like solid, septation, nodule or thick wall.
- any mention of blood flow inside it.
- any mention of free fluid in the abdomen.
Those details drive the plan. The two-word label does not.
The cyst that comes and goes with your cycle
Before menopause, the most common answer is a functional cyst.
MedlinePlus explains how one forms. A follicle grows each month to hold a developing egg. If it does not open and release the egg, fluid stays inside and a follicular cyst forms. A different cyst can form after the egg is released, and it may hold a small amount of blood.
MedlinePlus calls this a perfectly normal event, and a sign the ovaries are working well. These cysts often go away on their own within 8 to 12 weeks.
That is why the next step is so often a repeat ultrasound in 6 to 8 weeks. The scan is checking whether the finding is still there at all.
Why menopause changes how the same picture is read
MedlinePlus is direct about this. Cancer is very unlikely with a simple cyst. A complex cyst in a woman past menopause has a higher risk of being cancer.
The same image can mean two different things at 32 and at 62. The monthly cycle that makes cysts has stopped, so a new one has less ordinary explanation behind it.
What CA-125 can and cannot settle
MedlinePlus describes CA-125 as a way to help set a level of concern about a cyst, usually when the ultrasound is abnormal or you are past menopause. Your clinician may use the number to plan further testing.
NCI is clear about the limits of any tumor marker. A raised level does not mean a person has cancer, because noncancerous conditions can raise it. And not everyone with that cancer has a raised level.
So CA-125 is one input. It is not a verdict, in either direction.
Pain and symptoms that need a call
MedlinePlus lists sudden, severe pelvic pain, often with nausea and vomiting. That can be a sign of a twisted ovary or a cyst that has ruptured and bled. It says to contact your provider for severe pain, or bleeding that is not normal for you.
It also names a slower pattern worth reporting. Feeling full quickly when eating, losing your appetite, and losing weight without trying, on most days for at least two weeks.
What usually happens next
Often nothing happens except a repeat scan and a comparison with older images.
MedlinePlus says surgery is more likely to be needed for a complex cyst that does not go away, a cyst that is growing or causing symptoms, a simple cyst larger than 10 centimeters, and cysts in women near or past menopause.
If your report assigns a risk category, ask which one and what it recommends. What Does O-RADS Mean? covers the ovarian scoring system, and Imaging Tests for Cancer explains what each scan can and cannot show.
Sources
Words to know
Tap any term to see what it means.
Common questions
Does an adnexal mass mean ovarian cancer?
No. NCI defines an adnexal mass as a lump in tissue near the uterus, usually in the ovary or fallopian tube. That list includes ovarian cysts, ectopic pregnancy, and both benign and cancerous tumors. The described features decide the level of concern, not the phrase.
Why did they book a repeat scan instead of doing something now?
Functional cysts are the most common cause before menopause, and MedlinePlus says they often go away within 8 to 12 weeks. A scan 6 to 8 weeks later shows whether the finding has gone. That is information no blood test can give.
My CA-125 was raised. What does that mean?
NCI says a raised tumor marker does not mean a person has cancer, because noncancerous conditions can raise the level too. MedlinePlus describes CA-125 as a way to set a level of concern about a cyst and plan further testing.
Does it matter that I am past menopause?
Yes. MedlinePlus says a complex cyst after menopause carries a higher risk of being cancer, and that cancer is very unlikely with a simple cyst. Age changes how the same picture is read.
Questions to ask your doctor
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Sources last checked: 2026-08-09 what this meansLast updated: 2026-08-11Next planned review: 2027-08-09
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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