Fibroid Scan Examples: What an Ultrasound Shows

A scan report can feel full of unfamiliar words when you are already worried about heavy periods, pelvic pressure or fertility. Looking at fibroid scan examples can make those terms less intimidating and help you understand what a sonographer is assessing. Ultrasound is very good at showing the uterus and identifying many fibroids, but the meaning of a finding depends on its size, exact position, your symptoms and your plans for pregnancy.

Fibroids are common, non-cancerous growths made of muscle and fibrous tissue in or around the womb. Some cause no symptoms at all and are found incidentally. Others can be linked with heavy or painful periods, a feeling of fullness in the lower abdomen, frequent urination, constipation, pain during sex or difficulties with fertility and pregnancy. A clear ultrasound assessment provides useful information for the next conversation with your GP, gynaecologist or fertility specialist.

What fibroid scan examples can show

On an ultrasound image, a fibroid often appears as a rounded, solid area within the wall of the uterus or projecting from it. It may look darker or lighter than the surrounding muscle, and it can sometimes create a shadow behind it. The appearance is not identical in every person. Fibroids can become more mixed in texture as they change over time, particularly if they outgrow their blood supply and undergo degeneration.

A scan is not simply looking for a lump. The sonographer considers whether the uterus has changed shape, whether the lining of the womb is affected and whether the ovaries and surrounding pelvic structures can be seen clearly. Images are taken in more than one direction so that a measurement and location can be recorded accurately.

Example: a small fibroid within the uterine wall

A common report may describe a “small intramural fibroid” measuring, for example, 18 mm by 15 mm. Intramural means that it sits within the muscular wall of the uterus. Small intramural fibroids are frequently found during a pelvic scan and may not require treatment, especially when periods are manageable and there are no fertility concerns.

The report may also state which wall is involved, such as anterior, posterior or fundal. An anterior fibroid is towards the front of the uterus, a posterior fibroid is towards the back, and a fundal fibroid is near the top. These descriptions help clinicians compare future scans and judge whether the fibroid is likely to be affecting the uterine cavity.

Example: a fibroid projecting into the womb cavity

A “submucosal fibroid” grows towards the inside of the womb and can alter the shape of the endometrial cavity, where a pregnancy would implant. Even a relatively small submucosal fibroid can be relevant if someone has very heavy bleeding, recurrent miscarriage or is having fertility investigations.

An ultrasound report might say that a fibroid “indents” or “distorts” the endometrium. This does not automatically mean a serious problem, but it is a useful detail to discuss with the clinician managing your symptoms or fertility care. In some cases, further imaging or a hysteroscopy may be recommended to assess the cavity in more detail.

Example: a fibroid growing outwards from the uterus

A “subserosal fibroid” projects towards the outside surface of the womb. These fibroids are less likely to affect menstrual bleeding or the womb cavity, although larger ones can cause pressure symptoms. Someone may notice abdominal bloating, discomfort, a frequent need to pass urine or bowel pressure, depending on where the fibroid sits.

A subserosal fibroid attached by a narrow stalk may be described as pedunculated. The wording can sound alarming, but it simply describes its shape and attachment. Size, symptoms and the certainty of the ultrasound appearance all influence whether any follow-up is needed.

How a pelvic ultrasound is performed

A fibroid scan may include a transabdominal ultrasound, a transvaginal ultrasound, or both. A transabdominal scan is performed over the lower tummy, usually with a comfortably full bladder. It provides a wider overview of the pelvis and can be helpful when the uterus is enlarged by larger fibroids.

A transvaginal scan uses a slim, covered ultrasound probe inserted gently into the vagina. It is optional and performed with your consent. It usually gives more detailed views of the uterus, endometrium and ovaries because the probe is closer to the pelvic organs. For many people, it is the most informative part of a fibroid assessment, particularly where small fibroids or changes to the uterine cavity are suspected.

The scan should not be rushed. A qualified sonographer will obtain the necessary measurements, explain the process clearly and do what they can to help you feel at ease. At Nu Scan Ultrasound, our health and fertility scans are carried out in a calm private setting by experienced sonographers, with clear findings and appropriate advice on next steps.

Understanding the measurements on a fibroid report

Fibroids are normally measured in three dimensions, for example 42 mm x 37 mm x 35 mm. This gives a more complete picture than a single measurement. A fibroid may be compared with the size of a plum or orange in everyday conversation, but the millimetre measurements are more useful clinically.

One scan cannot always show how quickly a fibroid is changing. If a previous scan is available, the measurements can be compared. Small differences may simply reflect the angle of imaging or how the measurement was taken, rather than meaningful growth. A clinician will look at the overall pattern alongside your symptoms.

Your report may also include the size and position of the uterus, the thickness and appearance of the endometrium, and whether each ovary was visualised. “Not visualised” does not necessarily mean that something is wrong. Ovaries can be difficult to see because of bowel gas, their position in the pelvis or an enlarged uterus.

What ultrasound cannot answer on its own

Ultrasound is an excellent first-line test for fibroids, but it has limits. It may be harder to map every fibroid when there are several, when the womb is very enlarged or when the view is reduced by bowel gas. MRI can sometimes be used by a specialist when more detailed planning is needed, particularly before surgery or certain fibroid treatments.

A scan also cannot decide by itself whether treatment is necessary. A 5 cm fibroid may cause little trouble in one person and significant symptoms in another. Equally, a smaller fibroid can matter if it affects the womb cavity or contributes to troublesome bleeding. Your age, medical history, fertility plans, anaemia risk and personal preferences are all part of the decision.

Most fibroids are benign. However, any new pelvic symptoms should be assessed properly rather than assumed to be caused by fibroids. Ultrasound findings should always be considered in the context of your health and clinical history.

When to seek medical advice promptly

Book a GP or gynaecology appointment if your periods have become heavier, longer or more painful, you have ongoing pelvic pressure, or you are concerned about fertility. If you are soaking through sanitary protection very quickly, feel faint, have severe sudden pelvic pain, develop a fever with pelvic pain, or are pregnant and have pain or bleeding, seek urgent medical advice.

A private ultrasound can provide timely, focused information, but it does not replace emergency assessment or ongoing medical care where this is required. If a scan identifies a finding that needs onward review, having a clear written result can make the next step more straightforward.

A clear result is a useful starting point

Seeing fibroid scan examples can help you recognise the language used in reports, but your own images and symptoms are what matter most. A carefully performed pelvic ultrasound can clarify whether fibroids are present, where they are located and whether there are features worth discussing further. If you have symptoms or would simply value reassurance, choosing an experienced, clinically led scan service can give you the information to move forward with greater confidence.