Ovarian cyst

An ovarian cyst is a fluid-filled sac within the ovary.^[1] They usually cause no symptoms,^[1] but occasionally they may produce bloating, lower abdominal pain, or lower back pain.^[1] The majority of cysts are harmless.^[1][2] If the cyst either breaks open or causes twisting of the ovary, it may cause severe pain.^[1] This may result in vomiting or feeling faint,^[1] and even cause headaches.

Ovarian cyst
A simple ovarian cyst of most likely follicular origin
Specialty	Gynecology
Symptoms	None, bloating, lower abdominal pain, lower back pain^[1]
Complications	Rupture, twisting of the ovary^[1]
Types	Follicular cyst, corpus luteum cyst, cysts due to endometriosis, dermoid cyst, cystadenoma, ovarian cancer^[1]
Diagnostic method	Ultrasound^[1]
Prevention	Hormonal birth control^[1]
Treatment	Conservative management, pain medication, surgery^[1]
Prognosis	Usually good^[1]
Frequency	8% symptomatic before menopause^[1]

Most ovarian cysts are related to ovulation, being either follicular cysts or corpus luteum cysts.^[1] Other types include cysts due to endometriosis, dermoid cysts, and cystadenomas.^[1] Many small cysts occur in both ovaries in polycystic ovary syndrome (PCOS).^[1] Pelvic inflammatory disease may also result in cysts.^[1] Rarely, cysts may be a form of ovarian cancer.^[1] Diagnosis is undertaken by pelvic examination with a pelvic ultrasound or other testing used to gather further details.^[1]

Often, cysts are simply observed over time.^[1] If they cause pain, medications such as paracetamol (acetaminophen) or ibuprofen may be used.^[1] Hormonal birth control may be used to prevent further cysts in those who are frequently affected.^[1] However, evidence does not support birth control as a treatment of current cysts.^[3] If they do not go away after several months, get larger, look unusual, or cause pain, they may be removed by surgery.^[1]

Most women of reproductive age develop small cysts each month.^[1] Large cysts that cause problems occur in about 8% of women before menopause.^[1] Ovarian cysts are present in about 16% of women after menopause, and, if present, are more likely to be cancerous.^[1][4]

Signs and symptoms

 

Image of multiple ovarian cysts.

Ovarian cysts tend to produce non-specific symptoms (i.e., symptoms that could be caused be a large number of conditions).^[5] Some or all of the following symptoms may be present, though it is possible not to experience any symptoms:^[6]

• Abdominal pain. Dull aching pain within the abdomen or pelvis, especially during intercourse.
• Uterine bleeding. Pain during or shortly after beginning or end of menstrual period; irregular periods, or abnormal uterine bleeding or spotting.
• Fullness, heaviness, pressure, swelling, or bloating in the abdomen. Some ovarian cysts become large enough to cause the lower abdomen to visibly swell.^[2]
• When a cyst ruptures from the ovary, there may be sudden and sharp pain in the lower abdomen on one side.
• Large cysts can cause a change in frequency or ease of urination (such as inability to fully empty the bladder), or difficulty with bowel movements due to pressure on adjacent pelvic anatomy.^[5]
• Constitutional symptoms such as fatigue, headaches.
• Nausea or vomiting
• Weight gain

Other symptoms may depend on the cause of the cysts:^[6]

• Symptoms that may occur if the cause of the cysts is polycystic ovarian syndrome (PCOS) may include increased facial hair or body hair, acne, obesity and infertility.
• If the cause is endometriosis, then periods may be heavy, and intercourse painful.

The effect of cysts not related to PCOS on fertility is unclear.^[7]

In other cases, the cyst is asymptomatic, and is discovered incidentally while doing medical imaging for another condition.^[8] Ovarian cysts and other "incidentalomas" of the uterine adnexa appear in almost 5% of CT scans done on women.^[8]

Complications

The most common complications are cyst rupture, which occasionally leads to internal bleeding ("hemorrhagic cyst"), and ovarian torsion.^[5]

Cyst rupture

When the surface of cyst breaks, the contents can leak out; this is called a ruptured cyst. The main symptom is abdominal pain, which may last a few days to several weeks, but they can also be asymptomatic.^[9]

A ruptured ovarian cyst is usually self-limiting, and only requires keeping an eye on the situation and pain medications for a few days, while the body heals itself.^[5] Rupture of large ovarian cysts can cause bleeding inside the abdominal cavity.^[5] Rarely, enough blood will be lost that the bleeding will produce hypovolemic shock, which can be a medical emergency requiring surgery.^[5][10] However, normally, the internal bleeding is minimal and requires no intervention.^[5]

Ovarian torsion

Ovarian torsion is a very painful medical condition requiring urgent surgery.^[2] It can be caused by a pedunculated ovarian cyst that twisted in a way that cuts off the blood flow.^[2] It is most likely to be seen in women of reproductive age, though it has happened in young girls (premenarche) and postmenopausal women.^[11] Ovarian torsion may be more likely during pregnancy, especially during the third and fourth months of pregnancy, as the internal anatomy shifts to accommodate fetal growth.^[5] Diagnosis relies on clinical examination and ultrasound imaging.^[5]

Cysts larger than 4 cm are associated with approximately 17% risk.^{[citation needed]}

Types

 

Relative incidences of different types of ovarian cysts.^[12]

There are many types of ovarian cysts, some of which are normal and most of which are benign (non-cancerous).^[2]

Functional

Functional cysts form as a normal part of the menstrual cycle. There are several types of functional cysts:

• Follicular cyst, the most common type of ovarian cyst.^[2] In menstruating women, an ovarian follicle containing the ovum (an unfertilized egg) normally releases the ovum during ovulation.^[2] If it does not release the ovum, a follicular cyst of more than 2.5 cm diameter may result.^[6] A ruptured follicular cyst can be painful.^[2]
• A luteal cyst is a cyst that forms after ovulation, from the corpus luteum (the remnant of the ovarian follicle, after the ovum has been released).^[2] A luteal cyst is twice as likely to appear on the right side.^[2] It normally resolves during the last week of the menstrual cycle.^[2] A corpus luteum that is more than 3 cm is abnormal.^[6][8]
• Theca lutein cysts occur within the thecal layer of cells surrounding developing oocytes. Under the influence of excessive hCG, thecal cells may proliferate and become cystic. This is usually on both ovaries.^[6]

Non-functional

Non-functional cysts may include the following:

• An ovary with many cysts, which may be found in normal women, or within the setting of polycystic ovary syndrome
• Cysts caused by endometriosis, known as chocolate cysts
• Hemorrhagic ovarian cyst
• Dermoid cyst – the most common non-functional ovarian cyst, especially for women under the age of 30,^[11] they are benign (non-cancerous) with varied morphology.^[13] They can usually be diagnosed from ultrasound alone.^[13] Depending on size, growth rate (usually slow), and the age of the woman, treatment might involve surgical removal or watchful waiting.^[13] They are also called mature cystic teratomas.^[11]
• Ovarian serous cystadenoma – more common in women between the age of 30 and 40.^[11]
• Ovarian mucinous cystadenoma – although there is usually only one of these, they can grow very large, with diameters sometimes exceeding 50 cm (20 inches).^[11]
• Paraovarian cyst
• Cystic adenofibroma
• Borderline tumoral cysts

•  
  Transvaginal ultrasonography of a hemorrhagic ovarian cyst, probably originating from a corpus luteum cyst. The coagulating blood gives the content a cobweb-like appearance.
•  
  Transvaginal ultrasonography showing a 67 x 40 mm endometrioma, with a somewhat grainy content.

Risk factors

Risk factors include fertility status (more common in women of childbearing age) and irregular menstrual cycles.^[14] Using combined hormonal contraception may reduce the risk, especially with high-dose pills,^[14] but it does not treat existing cysts.^[3]

Diagnosis

 

A 2 cm left ovarian cyst as seen on ultrasound

 

Four kinds of ovarian cysts on MRI

Ovarian cysts are usually diagnosed by pelvic ultrasound, CT scan, or MRI, and correlated with clinical presentation and endocrinologic tests as appropriate.^[15] Ultrasound is the most important imaging modality, as abnormalities seen in a CT scan sometimes prove to be normal in ultrasound.^[5][8] If a different modality is needed, then MRIs are more reliable than CT scans.^[5]

Ultrasound

Usually, an experienced sonographer can readily identify benign ovarian cysts, often with a level of accuracy that rivals other approaches.^[5]

Follow-up imaging in women of reproductive age for incidentally discovered simple cysts on ultrasound is not needed until 5 cm, as these are usually normal ovarian follicles. Simple cysts 5 to 7 cm in premenopausal females should be followed yearly. Simple cysts larger than 7 cm require further imaging with MRI or surgical assessment. Because they are large, they cannot be reliably assessed by ultrasound alone; it can be difficult to see posterior wall soft tissue nodularity or thickened septation due to limited ultrasound beam penetrance at this size and depth. For the corpus luteum, a dominant ovulating follicle that typically appears as a cyst with circumferentially thickened walls and crenulated inner margins, follow up is not needed if the cyst is less than 3 cm in diameter.^[8] In postmenopausal women, any simple cyst greater than 1 cm but less than 7 cm needs yearly follow-up, while those greater than 7 cm need MRI or surgical evaluation, similar to reproductive age females.^[16]

 

An Axial CT demonstrating a large hemorrhagic ovarian cyst. The cyst is delineated by the yellow bars with blood seen anteriorly.

For incidentally discovered dermoids, diagnosed on ultrasound by their pathognomonic echogenic fat, either surgical removal or yearly follow up is indicated, regardless of the woman's age. For peritoneal inclusion cysts, which have a crumpled tissue-paper appearance and tend to follow the contour of adjacent organs, follow up is based on clinical history. Hydrosalpinx, or fallopian tube dilation, can be mistaken for an ovarian cyst due to its anechoic appearance. Follow-up for this is also based on clinical presentation.^[16]

For multilocular cysts with thin septation less than 3 mm, surgical evaluation is recommended. The presence of multiloculation suggests a neoplasm, although the thin septation implies that the neoplasm is benign. For any thickened septation, nodularity, vascular flow on color doppler, or growth over several ultrasounds, surgical removal may be considered due to concern of cancer.^[16]

Scoring systems

Most ovarian cysts are not malignant; however, some do become cancerous.^[2] There are several systems to assess risk of an ovarian cyst of being an ovarian cancer, including the RMI (risk of malignancy index), LR2 and SR (simple rules). Sensitivities and specificities of these systems are given in tables below:^[17]

Scoring systems	Premenopausal		Postmenopausal
	Sensitivity	Specificity	Sensitivity	Specificity
RMI I	44%	95%	79%	90%
LR2	85%	91%	94%	70%
SR	93%	83%	93%	76%

Ovarian cysts may be classified according to whether they are a variant of the normal menstrual cycle, referred to as a functional or follicular cyst.^[6]

Ovarian cysts are considered large when they are over 5 cm and giant when they are over 15 cm. In children, ovarian cysts reaching above the level of the umbilicus are considered giant.

Associated conditions

In juvenile hypothyroidism multicystic ovaries are present in about 75% of cases, while large ovarian cysts and elevated ovarian tumor marks are one of the symptoms of the Van Wyk and Grumbach syndrome.^[18]

The CA-125 marker in children and adolescents can be frequently elevated even in absence of malignancy and conservative management should be considered.

Polycystic ovarian syndrome involves the development of multiple small cysts in both ovaries due to an elevated ratio of leutenizing hormone to follicle stimulating hormone, typically more than 25 cysts in each ovary, or an ovarian volume of greater than 10 mL.^[19]

Larger bilateral cysts can develop as a result of fertility treatment due to elevated levels of HCG, as can be seen with the use of clomifene for follicular induction, in extreme cases resulting in a condition known as ovarian hyperstimulation syndrome.^[20] Certain malignancies can mimic the effects of clomifene on the ovaries, also due to increased HCG, in particular gestational trophoblastic disease. Ovarian hyperstimulation occurs more often with invasive moles and choriocarcinoma than complete molar pregnancies.^[21]

Risk of cancer

Accurately differentiating an cyst from a cancer is critical to management. Medical imaging showing a simple, smooth bubble of watery liquid is characteristic of a benign cyst.^[8] If the cyst is large, is multilocular, or has complex internal features, such as papillary (bumpy) projections into the cyst or solid areas inside the cyst, it is more likely to be cancerous.^[13]

A widely recognised method of estimating the risk of malignant ovarian cancer based on initial workup is the risk of malignancy index (RMI).^[13][22] It is recommended that women with an RMI score over 200 should be referred to a centre with experience in ovarian cancer surgery.^[23]

The RMI is calculated as follows:^[23]

RMI = ultrasound score × menopausal score × CA-125 level in U/ml.

There are two methods to determine the ultrasound score and menopausal score, with the resultant RMI being called RMI 1 and RMI 2, respectively, depending on what method is used:^[23]

Feature	RMI 1	RMI 2
Ultrasound abnormalities: Multilocular cyst Solid areas Bilateral lesions Ascites Intra-abdominal metastases	0 = no abnormality 1 = one abnormality 3 = two or more abnormalities	0 = none 1 = one abnormality 4 = two or more abnormalities
Menopausal score	1 = premenopausal 3 = postmenopausal	1 = premenopausal 4 = postmenopausal
CA-125	Quantity in U/ml	Quantity in U/ml

RMI 2 is regarded as more sensitive than RMI 1,^[23] but the model has low specificity, which means that many of the suspected cancers turn out to be overdiagnosed benign cysts.^[13] The calculation is often inaccurate during pregnancy, especially when CA-125 levels peak towards the end of the first trimester.^[5]

The International Ovarian Tumor Analysis (IOTA) group has produced a different model. Theirs relies on "simple descriptors" and "simple rules".^[5] An example of a simple descriptor for a benign cyst is "Unilocular cyst of anechoic content with regular walls and largest diameter less than 10 cm".^[5] An example of a simple rule is acoustic shadows are associated with benign cysts.^[5]

Histopathology

In case an ovarian cyst is surgically removed, a more definite diagnosis can be made by histopathology:

Type	Subtype	Typical microscopy findings	Image
Functional cyst	Follicular cyst	A variable inner layer of granulosa cells which are luteinized after puberty^[24] An outer layer of usually luteinized theca interna^[24]
	Corpus luteum cyst	A convoluted cyst lining of luteinized granulosa cells^[25] A prominent inner layer of fibrous tissue^[25] An outer layer of theca cells^[25]
Cystadenoma	Serous cystadenoma	Cyst lining consisting of a simple epithelium, whose cells may be either:^[26] columnar and tall and contain cilia, resembling normal tubal epithelium cuboidal and have no cilia, resembling ovarian surface epithelium
	Mucinous cystadenoma	Lined by a mucinous epithelium
Dermoid cyst		Well-differentiated components from at least two, and usually three,^[11] germ layers (ectoderm, mesoderm and/or endoderm).^[27]
Endometriosis		At least two of the following three criteria:^[28] Endometrial type stroma Endometrial epithelium with glands Evidence of chronic hemorrhage, mainly hemosiderin deposits
Borderline tumor		Atypical epithelial proliferation without stromal invasion.^[29]
Ovarian cancer		Many different types, but generally severe dysplasia/atypia and invasion.
Simple squamous cyst		Simple squamous epithelium and not conforming to diagnoses above (a diagnosis of exclusion)

Treatment

Most ovarian cysts occur naturally and go away in a few months without needing any treatment.^[30] In general, there are three options for dealing with an ovarian cyst:

• watchful waiting (e.g., waiting to see whether symptoms resolve on their own),^[8]
• additional imaging or investigation (e.g., getting an ultrasound later to see whether the cyst is growing),^[8] and
• surgery (e.g., surgical removal of the cyst).^[8]

Cysts associated with hypothyroidism or other endocrine problems are managed by treating the underlying condition.

About 95% of ovarian cysts are benign (not cancerous).^[31] Functional cysts and hemorrhagic ovarian cysts usually resolve spontaneously within one or two menstrual cycles.^[11]

However, the bigger an ovarian cyst is, the less likely it is to disappear on its own.^[32] Treatment may be required if cysts persist over several months, grow, or cause increasing pain.^[33] Cysts that persist beyond two or three menstrual cycles, or occur in post-menopausal women, may indicate more serious disease and should be investigated through ultrasonography and laparoscopy, especially in cases where family members have had ovarian cancer. Such cysts may require surgical biopsy. Additionally, a blood test may be taken before surgery to check for elevated CA-125, a tumour marker, which is often found in increased levels in ovarian cancer, although it can also be elevated by other conditions resulting in a large number of false positives.^[34]

Expectant management

If the cyst is asymptomatic and appears to be either benign or normal (i.e., a cyst with a benign appearance and a size of less than 3 cm diameter in premenopausal women or less than 1 cm in postmenopausal women^[8]), then delaying surgery, in the hope that it will prove unnecessary, is appropriate and recommended.^[8] Normal ovarian cysts require neither treatment nor additional investigations.^[8] Benign but medium-size cysts may prompt an additional pelvic ultrasound after a couple of months.^[8] (The larger the cyst, the sooner the follow-up imaging is done.^[8])

Symptom management

Pain associated with ovarian cysts may be treated in several ways:

• Pain relievers such as acetaminophen, nonsteroidal anti-inflammatory drugs,^[1] or opioids.
• While hormonal birth control prevents the development of new cysts in those who frequently get them,^[1] it is not useful for the treatment of current cysts.^[3]

Surgery

See also: Oophorectomy § Risks_and_adverse_effects

Although most cases of ovarian cysts are monitored and stabilize or resolve without surgery, some cases require surgery.^[35] Common indications for surgical management include ovarian torsion, ruptured cyst, concerns that the cyst is cancerous, and pain;^[11] some surgeons additionally recommend removing all large cysts.^[11]

The surgery may involve removing the cyst alone, or one or both ovaries.^[11] Very large, potentially cancerous, and recurrent cysts, particularly in menopausal women, are more likely to be treated by removing the affected ovary, or both the ovary and its Fallopian tube (salpingo-oophorectomy).^[11] For women of reproductive age, the aim is to preserve as much of the reproductive system as possible. It's often possible to just remove the cyst and leave both ovaries intact, which means the fertility should be unaffected.^[36]

Simple benign cysts can be drained through fine-needle aspiration.^[5] However, the risk of recurrence is fairly high (33–40%), and if a cancerous tumor was misdiagnosed, it could cause the cancer to spread.^[5]

The surgical technique is typically a minimally invasive or laparoscopic approach performed under general anaesthesia,^[11] unless the cyst is particularly large (e.g., 10 cm [4 inches] in diameter), or if pre-operative imaging, such as pelvic ultrasound, suggests malignancy or complex anatomy.^[13] For large cysts, open laparotomy or a mini-laparotomy (a smaller incision through the abdominal wall) may be preferred.^[13] Minimally invasive surgeries are not used when ovarian cancer is suspected.^[13][11] Additionally, if the pelvic surgery is being done, some women choose to have prophylactic salpingectomy done at the same time, to reduce their future risk of cancer.^[11]

If the cyst ruptures during surgery, the contents may irritate the peritoneum and cause internal adhesions.^[11] The cyst may be drained before removal, and the abdominal cavity carefully irrigated to remove any leaked fluids, to reduce this risk.^[11]

After surgery

The time it takes to recover from surgery is different for everyone. After the ovarian cyst has been removed, one will feel pain in the tummy, although this should improve in a few days.^[36]

After a laparoscopy or a laparotomy, it may take as long as 12 weeks before one can resume normal activities.^[36] If the cyst is sent off for testing, the results should come back in a few weeks. These symptoms may indicate an infection and need further attention:^[36]

• heavy bleeding
• severe pain or swelling in the abdomen
• a high temperature (fever)
• dark or smelly vaginal discharge^[36]

Cancer treatment

If the test results show that the cyst is cancerous, both of ovaries, womb (uterus) and some of the surrounding tissue may need to be removed. This would trigger an early menopause and means that pregnancy is no longer possible.^[36]

Treating conditions that cause ovarian cysts

If a condition that can cause ovarian cysts, such as endometriosis or polycystic ovary syndrome (PCOS), has been diagnosed, treatment may be different.^[36] For example, endometriosis may be treated with painkillers, hormone medication, and/or surgery to remove or destroy areas of endometriosis tissue.^[36]

Frequency

Most women of reproductive age develop small cysts each month. Simple, smooth ovarian cysts, smaller than 3 cm and apparently filled with water, are considered normal.^[8] Large cysts that cause problems occur in about 8% of women before menopause.^[1] Ovarian cysts are present in about 16% of women after menopause, and have a higher risk of being cancer than in younger women.^[1][4] If a cyst appears benign during diagnosis, then it has a less than 1% chance of being either cancer or borderline malignant.^[11]

Benign ovarian cysts are common in asymptomatic premenarchal girls and found in approximately 68% of ovaries of girls 2–12 years old and in 84% of ovaries of girls 0–2 years old. Most of them are smaller than 9 mm while about 10–20% are larger macrocysts. While the smaller cysts mostly disappear within 6 months the larger ones appear to be more persistent.^[37][38]

In pregnancy

Ovarian cysts are seen during pregnancy.^[14][5] They tend to be simple benign cysts measuring less than 5 cm in diameter, most commonly functional follicular or luteal cysts.^[14] They are more common earlier in the pregnancy.^[5] When they are detected early in pregnancy, such as during a routine prenatal ultrasound, they usually resolve on their own after a couple of months.^[14][5] Pregnancy changes hormone levels, and that can affect the diagnostic process.^[5] For example, some endometriomas (a type of benign ovarian cyst) will undergo decidualization, which can make them look more like a cancerous tumor in medical imaging.^[5]

A large cyst, if it puts pressure on the lower part of the uterus, can cause obstructed labor (also called labor dystocia).^[5]

Rarely, a cyst discovered during pregnancy will prove to be cancerous or to have cancerous potential.^[5] Malignant tumors discovered during pregnancy are usually germ cell, sex cord–gonadal stromal, or carcinomas, or slightly less commonly, borderline serous or mucinous cysts.^[5]

History

In 1809, Ephraim McDowell became the first surgeon to successfully remove an ovarian cyst.^[39]

Society and culture

Benign tumors were known in ancient Egypt, and an ovarian cyst has been identified in a mummy, Irtyersenu (c. 600 BC), that was autopsied in the early 19th century.^[40]

References

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Further reading

• McBee, W. C; Escobar, P. F; Falcone, T. (1 February 2007). "Which ovarian masses need intervention?". Cleveland Clinic Journal of Medicine. 74 (2): 149–157. doi:10.3949/ccjm.74.2.149. PMID 17333642. S2CID 45443236.
• "Ovarian cyst - Causes". nhs.uk. 28 Jun 2023. Retrieved 23 May 2024.
• Simcock, B; Anderson, N (February 2005). "Diagnosis and management of simple ovarian cysts: An audit". Australasian Radiology. 49 (1): 27–31. doi:10.1111/j.1440-1673.2005.01389.x. PMID 15727606.
• Ross, Elisa K.; Kebria, Medhi (August 2013). "Incidental ovarian cysts: When to reassure, when to reassess, when to refer". Cleveland Clinic Journal of Medicine. 80 (8): 503–514. doi:10.3949/ccjm.80a.12155. PMID 23908107. S2CID 28081941.
• Gerber, B.; Müller, H.; Külz, T.; Krause, A.; Reimer, T. (1 April 1997). "Simple ovarian cysts in premenopausal patients". International Journal of Gynecology & Obstetrics. 57 (1): 49–55. doi:10.1016/S0020-7292(97)02832-4. PMID 9175670. S2CID 34289061.
• Potter, Andrew W.; Chandrasekhar, Chitra A. (October 2008). "US and CT Evaluation of Acute Pelvic Pain of Gynecologic Origin in Nonpregnant Premenopausal Patients". RadioGraphics. 28 (6): 1645–1659. doi:10.1148/rg.286085504. PMID 18936027.
• Crespigny, Lachlan Ch.; Robinson, Hugh P.; Davoren, Ruth A. M.; Fortune, Denys (September 1989). "The 'simple' ovarian cyst: aspirate or operate?". BJOG. 96 (9): 1035–1039. doi:10.1111/j.1471-0528.1989.tb03377.x. PMID 2679871. S2CID 22501317.