Breast cyst aspiration is a minimally invasive procedure used to remove fluid from a breast cyst using a thin needle. It can be performed to confirm that a breast lump is fluid-filled and, when the cyst is causing pain or pressure, draining the fluid can also relieve symptoms.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
For many simple breast cysts, no treatment is necessary. Aspiration is generally considered when a cyst is uncomfortable, large or bothersome, or when removing its fluid can help clarify the nature of a breast lump.
The procedure is usually straightforward, and ultrasound may be used to guide the needle into the cyst accurately. Understanding what happens before, during and after aspiration can make the process easier to understand. For a broader overview of available approaches, see our guide to Breast Cyst Treatment.
What Is Breast Cyst Aspiration?
Breast cyst aspiration, also called fine-needle aspiration of a breast cyst, involves inserting a thin needle into the cyst and withdrawing the fluid inside it.
Unlike a surgical procedure, aspiration does not require an incision to remove the cyst. Once the fluid is removed, the cyst may collapse and the lump may become much smaller or disappear.
Aspiration can have both a diagnostic and therapeutic role. The procedure may help confirm that a lump contains fluid, while draining the cyst can reduce pressure and relieve discomfort.
When Is Breast Cyst Aspiration Recommended?
Not every breast cyst needs to be aspirated. Simple cysts that cause no symptoms can often be observed without treatment. Aspiration may be considered when:
- A cyst is painful or tender
- A cyst is large and causing pressure or discomfort
- A lump needs to be assessed to determine whether it is fluid-filled
- The cyst is bothersome or affecting daily activities
- Draining the cyst would help relieve symptoms
If imaging shows features that are not typical of a simple cyst, additional evaluation may be needed rather than treating the lesion as a routine cyst with aspiration alone.
Is Ultrasound Needed Before Breast Cyst Aspiration?
Ultrasound is commonly used to evaluate a breast lump and determine whether it is fluid-filled or solid. It can also be used during aspiration to help guide the needle into the cyst.
In some situations, a cyst that is easily felt may be aspirated without prior imaging. However, the appropriate approach depends on the characteristics and location of the lump and the clinical assessment.
When ultrasound guidance is used, the doctor can see the cyst on the screen while positioning the needle, helping target the fluid-filled area accurately.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
How Is Breast Cyst Aspiration Performed?
The exact technique can vary depending on the location and characteristics of the cyst, but the procedure generally follows several steps.
1. The breast is examined and the cyst is located
You will usually lie in a position that allows the doctor to comfortably access the affected area. The location of the cyst is identified by examination and, when appropriate, ultrasound.
2. The skin is cleaned
The skin over the area is cleaned carefully to reduce the risk of infection.
3. Local anaesthetic may be used
Depending on the procedure and clinical setting, a local anaesthetic may be used to numb the area before the needle is inserted.
You may feel a brief sting from the anaesthetic injection, followed by pressure or mild discomfort as the procedure is performed.
4. A thin needle is inserted into the cyst
The doctor gently guides a fine needle into the cyst. When ultrasound guidance is being used, the needle can be seen on the ultrasound image as it is advanced toward the fluid-filled area.
5. Fluid is withdrawn
A syringe is used to draw fluid out of the cyst. As the fluid is removed, the cyst may become smaller and the lump may collapse.
The appearance of the fluid can also provide useful information. For example, fluid that is clear or straw-coloured and not bloody may be reassuring when the lump disappears after aspiration.
6. The needle is removed
Once the cyst has been adequately drained, the needle is withdrawn and a small dressing may be placed over the site. The procedure generally does not require a surgical incision or stitches.
How Long Does Breast Cyst Aspiration Take?
Breast cyst aspiration is generally a short procedure, although the total time at the facility can vary depending on whether ultrasound imaging, preparation or additional assessment is required.
Your healthcare professional can give you a more specific estimate based on the location and size of the cyst and the type of procedure being planned.
Is Breast Cyst Aspiration Painful?
Most people experience some pressure or brief discomfort rather than significant pain. If local anaesthetic is used, it can help reduce discomfort during the procedure.
The sensation can vary depending on the location and size of the cyst and your individual sensitivity. If the cyst is causing pain because it is under pressure, removing the fluid may actually provide noticeable relief as the cyst collapses.
What Happens to the Fluid After Aspiration?
The fluid does not always need laboratory testing. If the cyst produces typical non-bloody fluid and the lump disappears after aspiration, further testing may not be necessary in some cases.
If the fluid is bloody, unusual, or if the lump does not disappear after aspiration, your doctor may recommend sending the fluid for laboratory evaluation or carrying out additional breast imaging or tissue sampling. The next step depends on the appearance of the cyst, the fluid obtained and the overall clinical and imaging findings.
What If No Fluid Comes Out?
Sometimes little or no fluid can be withdrawn from a breast lump. This may happen for different reasons, including the possibility that the lump is not a simple fluid-filled cyst.
If no fluid can be obtained, your doctor may recommend further imaging or another type of biopsy to determine what the lump represents. This is one reason aspiration should not be viewed as the only test needed for every breast lump.
What Happens After Breast Cyst Aspiration?
After the procedure, the area may feel mildly tender for a short time. You may also notice minor bruising or soreness around the needle site.
Most people can resume their usual activities according to their healthcare professional's advice. Specific instructions may vary depending on the procedure and your individual circumstances. If the cyst was causing pain or pressure, symptoms may improve after the fluid has been removed.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Can a Breast Cyst Come Back After Aspiration?
Yes. A breast cyst can refill with fluid after aspiration. Some cysts may require drainage again if they become symptomatic. A cyst returning after aspiration does not automatically mean that it is cancerous.
However, if a cyst repeatedly returns, becomes larger or continues to cause symptoms, it should be reassessed. Further treatment or additional testing may be considered depending on the findings.
What Are the Risks of Breast Cyst Aspiration?
Breast cyst aspiration is generally considered a low-risk procedure, but complications can occur.
Possible short-term effects include:
- Mild pain or tenderness
- Bruising at the needle site
- Minor bleeding
- Infection, although this is uncommon
- Refilling of the cyst
Is Breast Cyst Aspiration the Same as a Breast Biopsy?
No. Although both procedures can involve a needle, their purposes are different. During cyst aspiration, the main goal is to remove fluid from a cyst. The procedure can also help determine whether a lump is fluid-filled.
A core needle biopsy, in contrast, removes small pieces of tissue for examination under a microscope. It may be recommended when a breast lesion has solid or otherwise concerning features that cannot be adequately evaluated through aspiration.
The Bottom Line
Breast cyst aspiration is a simple, minimally invasive way to drain fluid from a breast cyst. A thin needle is inserted into the cyst, often with ultrasound guidance, and the fluid is withdrawn using a syringe. The procedure can both help confirm that a lump is cystic and relieve pain or pressure caused by the cyst.
Not every breast cyst needs aspiration. Simple cysts without troublesome symptoms can often be monitored. If the fluid is unusual, no fluid can be obtained, or the lump does not disappear after aspiration, additional evaluation may be necessary.
Because a breast lump should not be assumed to be a simple cyst without appropriate assessment, the decision to aspirate should be based on the clinical examination and imaging findings.
