breast CT scan preparation

Overview

A breast CT scan is a painless imaging test that uses X-rays to create detailed, cross-sectional pictures of your breast and chest area. It is different from a mammogram and is usually used to look more closely at an area that was seen on another test, or to help doctors plan treatment for breast cancer.

A breast CT scan is much less common than a mammogram. It is used for specific reasons, such as staging cancer or checking the lymph nodes.

This test is most often for people who have already been diagnosed with breast cancer, or those whose other breast imaging showed unusual findings that need closer inspection.

Symptoms

Common symptoms

• A new breast lump or thickening
• Nipple discharge or a nipple that turns inward
• Skin changes on the breast, such as dimpling or redness

Symptoms in children

• Breast CT scans are very rarely used for children. If your child needs this scan, the radiology team will explain the preparation in a way that is appropriate for their age.

Symptoms in older adults

• For older adults, the preparation is similar to other age groups. However, you should discuss your usual medications and any health conditions with your doctor, and arrange help with transport if needed.

Causes

Main causes

• A breast CT scan may be ordered to check how far breast cancer has grown, to see if it has reached nearby lymph nodes, or to guide a biopsy or surgery.
• It may also be used when other imaging tests are unclear, for example, when a mammogram or ultrasound does not give enough detail.

Risk factors

• You may be more likely to need a breast CT scan if you have been diagnosed with breast cancer.
• You may also be more likely to need one if you have very dense breast tissue, which can make other imaging tests harder to interpret.

When to see a doctor

See a doctor urgently if:

• If you notice a new breast lump that is hard or fixed, blood-stained nipple discharge, or a change in the shape or skin of your breast, speak to your doctor without delay.
• If you are already waiting for a breast CT scan and you develop difficulty breathing or a swollen face, seek emergency care immediately.

Book a routine appointment if:

• If you are over the age of 50, talk to your doctor about regular breast screening at your local health service.
• If you have a family history of breast cancer, ask your doctor about whether you need extra imaging or genetic counselling.

Diagnosis

A breast CT scan is an imaging procedure, not a diagnostic test that your doctor uses alone. It is usually done after a physical examination, mammogram, or ultrasound has shown something that needs a closer look. You will lie on a motorised table that slides through a large, ring-shaped scanner. The scanner takes many X-ray pictures from different angles, and a computer puts them together to create detailed images.

Tests that may be done

• Physical examination of the breasts
• Mammography (a low-dose X-ray of the breasts)
• Ultrasound (sound waves that create images)
• Magnetic resonance imaging (MRI) if more detailed images are needed
• Breast CT scan (sometimes with intravenous contrast dye)

What to expect at your appointment

Before the scan, you may need to change into a hospital gown and remove jewellery, hairpins, and any metal objects. If contrast dye is required, a small needle will be placed in a vein in your arm. When the dye is injected, you may feel a warm flush or a metallic taste in your mouth, which is normal. The scanner is painless. The whole appointment usually takes about 30 minutes, after which you can normally go home and resume your usual activities.

Treatment

This article is about preparation for a breast CT scan, not about treating a medical condition. The best preparation is to follow the instructions from your healthcare team. This will help the scan go smoothly and produce the most useful images.

Self-care at home

• Wear loose, comfortable clothing without metal zips, buttons, or underwire.
• Tell the radiographer if you are pregnant, think you might be pregnant, or are breastfeeding.
• If you have kidney disease or diabetes, ask your doctor for specific advice about eating, drinking, and your regular medication.
• Bring a list of your current medicines, including any allergy information.

Medical treatments

You will not be given any regular medication for a breast CT scan. If you are having contrast dye, the radiology team may give you a medication to reduce the risk of an allergic reaction, but only if they think it is necessary. Always tell your radiographer about any allergies you have had to dyes, injections, or medicines in the past.

When is surgery considered?

A breast CT scan is sometimes used before surgery. The pictures help surgeons plan the exact area to remove and check the surrounding tissue. Your surgeon will explain how the scan results will be used in your individual treatment plan.

Living with this condition

If you are having a breast CT scan, you may be feeling anxious or uncertain. That is completely normal. The scan itself is quick and does not cause pain. You can ask a friend or relative to come with you to the appointment for extra support.

Lifestyle tips

• Take a list of questions to your appointment so you can ask the radiographer about anything you are unsure about.
• If you have diabetes, talk to the radiology department in advance about how the scan may affect your insulin or meal schedule.
• Plan to rest after the scan if you feel tired, especially if you are having contrast dye.

Diet and exercise

You will usually be able to eat and drink normally before the scan unless you are having contrast dye. In that case, your doctor may ask you to avoid food or drink for up to 4 hours beforehand. After the scan, you can resume your normal diet and exercise routine unless you are told otherwise.

Mental health and emotional wellbeing

Waiting for a breast imaging test can trigger feelings of worry or low mood. It can help to talk to someone close to you, or to a professional counsellor. Try to focus on the fact that the scan will provide important information and help guide your next steps.

Prevention

A breast CT scan is a diagnostic test, so it is not something you need to prevent. However, if you are having a scan, you can help reduce the risk of complications by giving your healthcare team a full and accurate health history.

Screening programmes

Breast CT scan is not used for routine breast screening. Mammography is the standard screening test used by most health services. If you are due for breast screening, follow your local health service's recommendations.

Complications

If left untreated

• If a potentially serious finding is seen on the scan but no follow-up is arranged, the underlying condition could be missed or could grow.
• If you experience an allergic reaction to the contrast dye and do not seek medical help, it could become severe.
• If you have reduced kidney function and receive contrast dye without the doctor knowing, there is a small risk of kidney injury.

Long-term outlook

For the vast majority of people, a breast CT scan is safe, well-tolerated, and provides crucial information. If the scan shows an area of concern, there are many effective approaches to investigate and treat it. Early detection and a clear treatment plan greatly improve outcomes.

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