An ovarian cyst is a fluid-filled sac that develops on or inside an ovary. While many are benign and resolve without medical intervention, some can cause significant pain or lead to emergencies such as ovarian torsion or rupture. Most of these cysts are small, asymptomatic, and occur naturally during the ovulation process.
These growths primarily affect individuals during their reproductive years, though they can occur at any age. Most functional cysts disappear within eight to 12 weeks without treatment, but larger or non-functional cysts may require surgical removal or hormonal management to prevent recurrence. Diagnosis typically involves a combination of pelvic exams and imaging, such as transvaginal ultrasounds, to determine if a mass is fluid-filled or solid.
The risk of complications increases with the size of the cyst. A ruptured cyst can cause sudden, severe abdominal pain and internal bleeding, while a large cyst may cause the ovary to twist—a condition known as ovarian torsion—which can occur when enlarged cysts cause the ovary to twist around itself and requires surgery to untwist or remove the ovary.
Common Symptoms and Warning Signs of Ovarian Cysts
Many ovarian cysts produce no symptoms and are discovered incidentally during routine check-ups. However, when symptoms do occur, they often manifest as a feeling of fullness, bloating, or pressure in the lower abdomen. Patients may experience a dull or sharp ache on the side of the body where the cyst is located.
Less frequent symptoms can include pelvic pain, a dull ache in the lower back and thighs, and pain during sexual intercourse. Some individuals report irregular menstrual cycles, unusual vaginal bleeding, or unexplained weight gain. In some cases, a cyst may press against the bladder or bowel, leading to frequent urination or difficulty emptying the bladder completely.
A ruptured ovarian cyst presents as a medical emergency. Warning signs include a sudden onset of severe pelvic or abdominal pain, nausea, vomiting, and vaginal bleeding. Because these symptoms can mimic other acute abdominal issues, immediate medical evaluation is necessary.
Types of Ovarian Cysts and Their Causes
Medical professionals categorize ovarian cysts based on their origin and composition. The most frequent are functional cysts, which are directly tied to the menstrual cycle. These include follicular cysts, which form when a follicle fails to release an egg and continues to grow, and corpus luteum cysts, which occur when the follicle closes after egg release but fills with fluid. These are typically benign and resolve on their own.
Non-functional cysts are often more complex and may require different treatment paths:
- Dermoid Cysts (Teratomas): These develop from embryonic cells and can contain tissues such as hair, skin, or teeth.
- Cystadenomas: These form on the ovary’s surface and contain a watery or mucouslike fluid.
- Endometriomas: These result from endometriosis, where uterine cells grow outside the uterus and can attach to an ovary to form a cyst.
- Ovarian Cancer Cysts: These are solid masses of cancer cells, which are more common after menopause.
Several factors increase the risk of developing these growths. Use of fertility medications that stimulate ovulation, such as clomiphene (Clomid), is a known risk factor. Other contributors include pregnancy, severe pelvic infections, and underlying conditions such as hormone disorders, endometriosis, and polyendocrine metabolic ovarian syndrome (PMOS), formerly known as polycystic ovary syndrome (PCOS).
Diagnostic Procedures and Medical Testing
The diagnostic process usually begins with a routine pelvic exam, where a physician may find a cyst. A transvaginal ultrasound is a tool used to confirm the presence of a cyst, determine its exact location, and identify whether the mass is solid, fluid-filled, or a mixture of both.
Depending on the ultrasound results, doctors may order supplemental tests. A pregnancy test is often used to identify corpus luteum cysts, which are common during pregnancy. For cysts that appear partially solid and if you’re at a high risk of ovarian cancer, a CA 125 blood test may be ordered. This test measures cancer antigen 125, a protein often elevated in ovarian cancer, though it can also rise due to noncancerous conditions like endometriosis, uterine fibroids, and pelvic inflammatory disease.
In cases where a diagnosis remains unclear or if a cyst needs immediate removal, laparoscopy is employed. This involves inserting a laparoscope (a long, thin tube with a high-resolution camera attached to the end) through a small abdominal incision, allowing the surgeon to see the ovaries and sometimes remove the cyst.
Treatment Options and Surgical Interventions
Treatment is not universal; it depends on the patient’s age, the type and size of the cyst, and the severity of symptoms. For small, asymptomatic, fluid-filled cysts, the standard medical approach is to wait and see if the cyst goes away within a few months. Physicians may monitor the cyst over several months with periodic ultrasounds to see if the cyst changes in size.
For those who develop recurrent functional cysts, hormonal contraceptives may be prescribed. While these medications cannot shrink an existing cyst, they prevent ovulation, which reduces the likelihood of new functional cysts forming.
Surgery is recommended when a cyst is large, doesn’t look like a functional cyst, is growing, continues through two or three menstrual cycles, or causes pain. There are two primary surgical paths:
- Ovarian Cystectomy: The surgical removal of the cyst while leaving the rest of the ovary intact.
- Oophorectomy: The removal of the affected ovary.
Prevention and Long-Term Outlook
Functional ovarian cysts cannot be prevented if a person is ovulating. However, the use of hormonal birth control can lower the chances of developing new cysts. Regular pelvic exams are recommended for early detection (though for many people, an ultrasound is necessary to identify a cyst).
The prognosis for most ovarian cysts is positive. Functional cysts generally resolve within 8 to 12 weeks. The likelihood of a cyst being benign is higher for individuals who are still menstruating. Conversely, the risk of malignancy increases with age, making consistent screenings vital for older populations.
For those managing a diagnosis, the next step is typically a scheduled follow-up ultrasound to track the size and stability of the cyst. Patients are advised to seek immediate medical help if they experience the symptoms associated with rupture or torsion.