Adnexal Mass on Ultrasound: What an Ovarian Cyst or Mass May Mean

Related service: In-Office Gynecologic Ultrasound

An adnexal mass is a cyst or solid finding near the uterus, most often arising from an ovary or fallopian tube. Most ovarian cysts in premenopausal patients are benign and many resolve without treatment. The appropriate plan depends on age, menopause status, symptoms, pregnancy possibility, size, ultrasound appearance, change over time, family history, and tumor-marker context. The word mass does not mean cancer, but complex or persistent findings require structured risk assessment.

Common Benign Findings

Functional cysts form during normal ovulation and include follicular and corpus luteum cysts. They often resolve over one or two cycles. Hemorrhagic cysts contain blood and can cause sudden pain, especially if they rupture. Their ultrasound pattern and interval resolution help confirm the diagnosis.

Endometriomas contain old blood related to endometriosis and may cause painful periods, intercourse pain, infertility, or chronic pelvic pain. Dermoid cysts, also called mature cystic teratomas, can contain fat, hair, or calcified tissue and do not usually disappear spontaneously. Hydrosalpinx, paratubal cysts, fibroids, and bowel or urinary structures can also appear as adnexal findings.

Why Menopause Status Matters

Ovulation-related cysts are common before menopause. After menopause, functional cysts are less expected, so persistence and morphology receive greater attention. A small simple cyst can still be benign after menopause, but complex components, papillary projections, solid vascular tissue, ascites, or growth increase concern.

Age alone does not determine management. A premenopausal patient can have ovarian cancer, and a postmenopausal patient can have a benign cyst. Risk assessment combines the ultrasound pattern, symptoms, family or genetic risk, examination, and selected laboratory tests.

What Ultrasound Should Describe

A useful report documents which side the mass is on, overall dimensions, whether it is simple or multilocular, internal echoes, septations, wall irregularity, solid components, papillary projections, blood flow, acoustic shadowing, free fluid, and the appearance of the opposite ovary. Growth should be assessed with comparable measurements and images rather than a vague statement that the cyst is larger.

Standardized systems such as O-RADS can help communicate malignancy risk and follow-up recommendations, but they do not replace clinical judgment. A technically limited scan, uncertain organ of origin, or discordance between symptoms and imaging may require repeat expert ultrasound, MRI, or surgical evaluation.

Do Tumor Markers Diagnose Cancer?

CA-125 is not a screening test for ovarian cancer in average-risk asymptomatic patients and cannot diagnose a mass by itself. It can be elevated with endometriosis, fibroids, menstruation, infection, pregnancy, liver disease, and other benign conditions. A normal value does not exclude malignancy.

CA-125 and other markers are used selectively based on age, ultrasound appearance, suspected tumor type, and referral planning. In younger patients, markers for germ-cell or sex-cord stromal tumors may be appropriate when imaging suggests those possibilities. The result must be interpreted with the scan rather than treated as a simple positive or negative cancer test.

Observation Versus Repeat Imaging

Observation is reasonable for many simple or classic benign-appearing cysts when symptoms are mild and malignancy risk is low. The interval and need for repeat imaging depend on size, morphology, age, and symptoms. Repeating every cyst indefinitely can create cost and anxiety without improving care, while failing to follow a complex lesion can miss important change.

During observation, patients should know the warning symptoms of torsion or rupture. The plan should identify when the next scan occurs, what change will trigger surgery or referral, and whether activity modification is recommended. New symptoms can justify earlier reassessment.

When Surgery Is Considered

Surgery may be recommended for persistent or enlarging masses, complex or suspicious features, significant pain or pressure, torsion risk, uncertain diagnosis, or inability to exclude malignancy. Fertility goals, ovarian reserve, menopause status, and the amount of normal ovary visible affect whether cystectomy or removal of the ovary and tube is preferred.

Laparoscopy is possible for many benign-appearing masses, but very large size, extensive adhesions, hemodynamic instability, or concern for malignancy may require a different approach. Preventing rupture can be important when cancer is possible. When risk is high, referral to a gynecologic oncologist before surgery improves staging and treatment planning.

Torsion and Rupture

Ovarian torsion causes sudden severe one-sided pain, often with nausea or vomiting. It is a surgical emergency because blood supply can be lost. Ultrasound supports the diagnosis but normal Doppler flow does not completely exclude torsion. Intermittent pain may occur if the adnexa twists and untwists.

A ruptured cyst may cause abrupt pain and internal bleeding. Stable patients with reassuring findings can often be observed. Fainting, low blood pressure, worsening pain, shoulder pain, significant free fluid, anticoagulant use, or pregnancy raises the urgency.

Adnexal Masses During Pregnancy

Many masses found in early pregnancy are corpus luteum cysts and resolve. Persistent, complex, large, or symptomatic masses require individualized imaging and timing. Surgery may be necessary for torsion, rupture, rapid growth, or malignancy concern. The risks of observation, surgery, and gestational timing are weighed together.

Frequently Asked Questions

Does a complex cyst mean ovarian cancer?

No. Hemorrhagic cysts, endometriomas, dermoids, and benign neoplasms can be complex. Specific ultrasound features and clinical context determine risk.

Can CA-125 rule cancer in or out?

No. It can be elevated in benign conditions and normal in some cancers. It is one part of selected risk assessments.

Will a simple ovarian cyst go away?

Many functional cysts resolve before menopause. Resolution is less predictable for dermoids, endometriomas, cystadenomas, and postmenopausal cysts.

Can a cyst cause infertility?

The cyst itself may not. Endometriosis, surgery that reduces ovarian tissue, tubal disease, or the underlying condition can affect fertility.

When is pain an emergency?

Sudden severe one-sided pain, vomiting, fainting, shoulder pain, pregnancy-associated pain or bleeding, fever, or rapidly worsening symptoms needs urgent evaluation.

The Bottom Line

Adnexal Mass on Ultrasound is best approached with individualized assessment rather than a one-size-fits-all plan. A visit can clarify what evaluation or treatment fits your symptoms, history, and goals.

Schedule a Visit

Complete Healthcare offers individualized evaluation and counseling for ovarian cysts for patients in Richland and the Tri-Cities. Call 509-392-6700 to schedule a gynecology visit.

Complete Healthcare, Richland, WA

Richard Lorenzo, D.O.

Women’s Health and Wellness Care in Richland, WA