Ovarian cysts are among the most common findings in women's health — and one of the most misunderstood. In my practice at Victoria Medical in London Victoria, I see women who have been told an ovarian cyst was found on a scan and have been left uncertain about what that means, whether it is dangerous, and what happens next. The answer, in most cases, is reassuring: the vast majority of ovarian cysts are benign, cause no lasting harm, and resolve on their own. But some require monitoring, and a small number need treatment. Knowing which category you are in requires a proper assessment.
Research confirms that up to 90% of premenopausal women will develop a benign ovarian cyst at some point in their lives.4 In a survey of 33,739 women, 46.7% had an adnexal cyst detectable on transvaginal ultrasound, with 63.2% showing spontaneous resolution on subsequent scans.7 These figures reflect how common and, in most cases, how self-limiting ovarian cysts are. The clinical challenge is not diagnosing the cyst — ultrasound does that reliably — but characterising it accurately so that the right management decision is made.
"Finding an ovarian cyst on a scan is not a diagnosis — it is the beginning of a clinical assessment. The type, size, and characteristics of the cyst determine everything that follows."
What Are Ovarian Cysts?
An ovarian cyst is a fluid-filled sac that forms on or within an ovary. Cysts range from a few millimetres to several centimetres in diameter. They may be simple (containing only fluid) or complex (containing solid components, septations, or internal debris). The distinction between simple and complex is clinically important because it informs the risk of malignancy and the appropriate management pathway.7
The ovaries are active structures throughout the reproductive years, producing follicles each month as part of the normal menstrual cycle. Most ovarian cysts arise directly from this follicular activity and are therefore entirely physiological. Others arise from pathological processes — endometriosis, benign tumours, or, rarely, malignancy. The clinical assessment aims to distinguish between these categories as efficiently and accurately as possible.
Types of Ovarian Cyst
Understanding the type of cyst is the foundation of management. The following table summarises the most clinically relevant types, their characteristics, and their typical management approach.
| Type | Origin | Typical Size | Management |
|---|---|---|---|
| Follicular cyst | Dominant follicle fails to rupture | 2–8 cm | Expectant — resolves within 1–3 cycles |
| Corpus luteum cyst | Post-ovulation corpus luteum fills with fluid | 2–6 cm | Expectant — usually resolves within 6–8 weeks |
| Endometrioma | Endometrial tissue implants on ovary | 2–10 cm | Gynaecologist review; surgery if symptomatic or large |
| Dermoid cyst (teratoma) | Germ cell origin; contains hair, fat, teeth | 5–15 cm | Surgical removal (laparoscopy) if symptomatic or >5 cm |
| Serous cystadenoma | Ovarian surface epithelium | 5–20 cm | Monitoring ± surgery depending on size and features |
| Mucinous cystadenoma | Ovarian surface epithelium; can grow very large | 10–30 cm | Surgical removal recommended |
| Polycystic ovaries (PCOS) | Multiple small follicles; hormonal dysregulation | Multiple <10 mm | Medical management; no cyst removal required |
Functional cysts — follicular and corpus luteum — account for the majority of ovarian cysts found in premenopausal women. They are a normal part of ovarian physiology and, in the absence of symptoms or concerning ultrasound features, require no intervention beyond a follow-up scan to confirm resolution.1 The Cochrane review by Grimes et al. confirmed that oral contraceptives offer no advantage over watchful waiting for functional cyst resolution — a finding that has shifted clinical practice firmly towards expectant management for uncomplicated functional cysts.2
Symptoms and Warning Signs
Many ovarian cysts are entirely asymptomatic and are discovered incidentally during a pelvic ultrasound performed for another reason. When symptoms do occur, they typically reflect the size of the cyst, its effect on surrounding structures, or a complication such as rupture or torsion.
Common symptoms of an ovarian cyst include a dull ache or heaviness in the lower abdomen or pelvis, bloating or a feeling of fullness, discomfort during sexual intercourse, and changes to the menstrual cycle — including irregular periods, heavier bleeding, or intermenstrual spotting. These symptoms are non-specific and overlap with many other gynaecological conditions, which is why imaging is essential for accurate diagnosis.
Seek Urgent Medical Attention If You Experience:
- Sudden, severe pelvic or abdominal pain — may indicate cyst rupture or ovarian torsion
- Pain accompanied by fever, nausea, or vomiting
- Rapid abdominal distension
- Dizziness, faintness, or signs of internal bleeding
- Pain that wakes you from sleep or prevents normal activity
Ovarian torsion — where the ovary twists on its blood supply — is a surgical emergency requiring immediate hospital assessment.
Diagnosis by Pelvic Ultrasound
Pelvic ultrasound — and specifically transvaginal ultrasound (TVUS) — is the gold standard investigation for ovarian cysts. It provides real-time, high-resolution imaging of the ovaries and allows the clinician to assess the size, morphology, and vascularity of any cyst identified. At Victoria Medical, our pelvic ultrasound service is performed by specialist sonographers with same-day results, allowing me to review findings and discuss a management plan with you at the same appointment.
The ultrasound assessment of an ovarian cyst focuses on several key features: whether the cyst is unilocular (single chamber) or multilocular (multiple chambers), whether it contains solid components, whether there are papillary projections or mural nodules, and whether there is internal blood flow on Doppler imaging. These features are systematically evaluated using the IOTA (International Ovarian Tumour Analysis) Simple Rules, a validated classification system that assigns cysts to benign, malignant, or inconclusive categories based on five benign and five malignant ultrasound features.3
Garg et al. (2017) validated IOTA Simple Rules in a prospective study and found them to be highly sensitive and specific for predicting ovarian malignancy preoperatively — and importantly, reproducible and straightforward to apply in clinical practice.3 This means that a well-performed transvaginal ultrasound by an experienced sonographer provides a reliable basis for management decisions in the vast majority of cases.
| IOTA Benign Features (B) | IOTA Malignant Features (M) |
|---|---|
| Unilocular cyst | ⚠ Irregular solid tumour |
| Solid components < 7 mm | ⚠ Ascites present |
| Acoustic shadowing | ⚠ ≥ 4 papillary structures |
| Smooth multilocular tumour < 100 mm | ⚠ Irregular multilocular solid tumour ≥ 100 mm |
| No detectable blood flow | ⚠ Very strong blood flow on Doppler |
IOTA Simple Rules: if only B features present → likely benign; if only M features present → likely malignant; if both or neither → inconclusive (refer for further assessment). Source: Garg et al. 2017.3
For cysts that are inconclusive on ultrasound, or where the clinical picture warrants further evaluation, MRI provides excellent soft-tissue characterisation without radiation exposure. CA-125 — a blood marker associated with ovarian cancer — is a useful adjunct in postmenopausal women and in women with complex cysts, though it is less specific in premenopausal women where it can be elevated by endometriosis, fibroids, pelvic inflammatory disease, and even menstruation itself.6
Monitoring and Management
The management of an ovarian cyst is determined by its type, size, ultrasound characteristics, the patient's age, menopausal status, and symptoms. The RCOG Green-top Guideline No. 62 provides the evidence-based framework I use in clinical practice.6 The following table summarises the management pathways for the most common clinical scenarios.
| Scenario | Recommended Management | Follow-up |
|---|---|---|
| Simple cyst < 5 cm, premenopausal | Expectant management (watchful waiting) | Repeat TVUS in 6–12 weeks to confirm resolution |
| Simple cyst 5–7 cm, premenopausal | Expectant management; gynaecologist review | 6-monthly TVUS for 1 year |
| Simple cyst > 7 cm, premenopausal | Further imaging (MRI); consider surgical referral | Gynaecologist-led management |
| Any cyst with M features (IOTA) | Urgent gynaecologist referral; CA-125 ± MRI | Expedited assessment |
| Endometrioma | Gynaecologist review; surgery if symptomatic or > 4 cm | Annual TVUS if managed conservatively |
| Dermoid cyst > 5 cm | Laparoscopic cystectomy recommended | Post-operative follow-up |
| Any cyst, postmenopausal | CA-125 + TVUS; gynaecologist review | Lower threshold for surgical referral |
Expectant management — watchful waiting with interval ultrasound — is appropriate for the majority of simple cysts in premenopausal women. Castillo et al. demonstrated that simple unilocular adnexal cysts in asymptomatic postmenopausal women have a very low malignancy risk and frequently resolve spontaneously over a median follow-up of 15 months, supporting a conservative approach even in this higher-risk group when cyst features are reassuring.5
When surgery is indicated, laparoscopic cystectomy — keyhole removal of the cyst while preserving the ovary — is the preferred approach. It offers shorter recovery times, less post-operative pain, and better fertility preservation compared to open surgery. Oophorectomy (removal of the ovary) is reserved for cases where cyst removal alone is not technically feasible, or where malignancy is suspected.
When Should You See a Gynaecologist?
A private gynaecologist assessment is appropriate in any of the following situations. You do not need a GP referral to be seen at Victoria Medical — you can book directly and be seen within 24–48 hours.
Book a Gynaecologist Assessment If:
- You have been told an ovarian cyst was found on a scan and have not received a clear management plan
- You have persistent pelvic pain, bloating, or pressure that has not been explained
- You have irregular periods, particularly if associated with pelvic discomfort
- You have a family history of ovarian cancer and want a baseline assessment
- You are trying to conceive and want to rule out ovarian pathology affecting fertility
- You are postmenopausal and a cyst has been identified on any imaging
- You have previously been diagnosed with endometriosis and want to monitor for endometrioma
- You want a second opinion on a cyst that has been found but not fully characterised
Private vs NHS Assessment for Ovarian Cysts
| Factor | NHS | Victoria Medical (Private) |
|---|---|---|
| Time to first appointment | Weeks to months via GP referral | 24–48 hours, no referral needed |
| Ultrasound access | Separate appointment; further wait | Same-day pelvic ultrasound available |
| Results turnaround | Days to weeks | Same appointment or within 24 hours |
| Consultation length | Typically 10–15 minutes | 30–45 minutes with Dr Xynopoulos |
| Continuity of care | Variable; different clinicians | Same consultant throughout |
| CA-125 blood test | Ordered separately; further wait | Same-day blood test available on site |
Your Patient Journey at Victoria Medical
When you come to Victoria Medical with a known or suspected ovarian cyst, the assessment follows a structured pathway designed to give you a clear answer and a clear plan — at the same appointment wherever possible.
Initial Consultation
A 30–45 minute consultation with Dr Xynopoulos. We review your symptoms, menstrual history, family history, and any previous imaging. This conversation shapes the investigation plan.
Same-Day Pelvic Ultrasound
A transvaginal ultrasound is performed on site by our specialist sonographer. We assess cyst size, morphology, vascularity, and IOTA features. Results are available immediately.
Blood Tests if Indicated
CA-125, hormone panel, or thyroid function tests can be taken on site and processed within 24 hours. No separate appointment or laboratory visit is required.
Results and Management Plan
Dr Xynopoulos reviews all findings and explains what they mean in plain language. You leave with a written management plan — whether that is reassurance, a follow-up scan date, or a referral for specialist treatment.
Monitoring and Follow-Up
For cysts requiring interval surveillance, we schedule follow-up transvaginal ultrasounds at the clinically appropriate intervals — typically 6 or 12 weeks — and contact you with results promptly.
Related Articles
Signs You Should See a Private Gynaecologist
Read article Women's HealthIrregular Periods: Causes and When to See a Gynaecologist
Read article DiagnosticsWhat Is a Pelvic Ultrasound Scan?
Read articleFrequently Asked Questions
Can an ovarian cyst affect my fertility?
Most functional cysts do not affect fertility and resolve without treatment. Endometriomas and large cysts can affect ovarian reserve and egg quality if left unmanaged. If you are trying to conceive, a gynaecologist assessment with pelvic ultrasound and hormone testing will give you a clear picture of your ovarian health.
Will I need surgery for my ovarian cyst?
The majority of ovarian cysts in premenopausal women do not require surgery. Simple functional cysts typically resolve within one to three menstrual cycles with watchful waiting. Surgery is considered for cysts that are large (generally > 5–7 cm), persistent, symptomatic, or have features suggesting a dermoid, endometrioma, or other pathological type.
How do I know if my ovarian cyst has ruptured?
A ruptured cyst typically causes sudden, sharp pelvic pain, often on one side. The pain may be accompanied by nausea, dizziness, or light-headedness if there is significant internal bleeding. A ruptured cyst with haemorrhage is a medical emergency — attend A&E immediately or call 999.
Is a transvaginal ultrasound uncomfortable?
Transvaginal ultrasound uses a small, smooth probe inserted a short distance into the vagina. Most women find it mildly uncomfortable rather than painful. It provides significantly better image quality than a transabdominal scan for ovarian assessment, particularly for smaller cysts. You can ask for a transabdominal scan instead if you prefer, though image quality may be reduced.
Can ovarian cysts come back after treatment?
Functional cysts can recur because they arise from the normal menstrual cycle. Endometriomas have a known recurrence rate after surgery, particularly if the underlying endometriosis is not treated. Dermoid cysts and cystadenomas have a low recurrence rate after complete surgical removal. Regular follow-up ultrasound is the most reliable way to monitor for recurrence.
Do I need a GP referral to be seen at Victoria Medical?
No referral is needed. You can book directly with Dr Xynopoulos via our website or by calling 020 3146 9508. We offer same-day and next-day appointments at our clinic at 170 Vauxhall Bridge Road, two minutes from Victoria Station.
References
- 1.Knudsen UB et al. Management of ovarian cysts. Acta Obstet Gynecol Scand. 2004;83(11):1012–21. https://doi.org/10.1111/j.0001-6349.2004.00607.x
- 2.Grimes DA et al. Oral contraceptives for functional ovarian cysts. Cochrane Database Syst Rev. 2006;(4):CD006134. https://doi.org/10.1002/14651858.CD006134.pub2
- 3.Garg S et al. Evaluation of IOTA Simple Ultrasound Rules to Distinguish Benign and Malignant Ovarian Masses. J Obstet Gynaecol India. 2017;67(5):343–349. https://pmc.ncbi.nlm.nih.gov/articles/PMC5620878/
- 4.Farahani L, Morgan S, Datta S. Benign ovarian cysts. Obstet Gynaecol Reprod Med. 2017;27(10):306–311. https://doi.org/10.1016/j.ogrm.2017.07.003
- 5.Castillo G, Alcázar JL, Jurado M. Natural history of sonographically detected simple unilocular adnexal cysts in asymptomatic postmenopausal women. Gynecol Oncol. 2004;92(3):965–969. https://doi.org/10.1016/j.ygyno.2003.11.020
- 6.RCOG Green-top Guideline No. 62. Management of Suspected Ovarian Masses in Premenopausal Women. Royal College of Obstetricians and Gynaecologists. 2011. https://www.rcog.org.uk/media/yhujmdvr/gtg_62-1.pdf
- 7.StatPearls. Ovarian Cyst. NCBI Bookshelf. NBK560541. Updated 2023. https://www.ncbi.nlm.nih.gov/books/NBK560541/