Home › Blog › Phyllodes Tumour vs Fibroadenoma
Phyllodes Tumour vs Fibroadenoma: What Is the Difference?
Fibroadenomas and phyllodes tumours are two types of fibroepithelial breast lesions. Both can present as:
- A solid breast lump
- A smooth or well-defined mass
- A mobile breast lump
- A lesion that looks similar on ultrasound
However, they are not the same condition, and their treatment can be different. The most important practical message is:
A breast lump that is rapidly growing or behaving differently from a typical fibroadenoma deserves reassessment.
What Is a Fibroadenoma?
A fibroadenoma is a common benign breast tumour made up of glandular and connective tissue. It is particularly common in younger women. It often feels:
- Smooth
- Firm or rubbery
- Well-defined
- Mobile
Many appropriately diagnosed fibroadenomas can be observed without surgery. See also our guide to breast lumps: causes, symptoms and diagnosis.
What Is a Phyllodes Tumour?
A phyllodes tumour is a less common fibroepithelial tumour of the breast. Pathology classifies it as:
- Benign
- Borderline
- Malignant
Most phyllodes tumours are benign, but even benign phyllodes tumours behave differently from ordinary fibroadenomas and may require surgical treatment.
Are Phyllodes Tumours Breast Cancer?
Not all of them. A phyllodes tumour may be benign, borderline or malignant. A benign phyllodes tumour is not the same as breast cancer. Malignant phyllodes tumours are uncommon and are biologically different from the more common types of breast carcinoma.
Who Gets Phyllodes Tumours?
Phyllodes tumours can occur at different ages but tend to occur in women who are older than the typical age group for fibroadenomas. Age alone, however, cannot distinguish the two. A young woman can develop a phyllodes tumour, and an older woman can have a fibroadenoma.
What Does a Phyllodes Tumour Feel Like?
A phyllodes tumour may feel smooth, firm, mobile and well-defined. In other words, it can feel very similar to a fibroadenoma.
One feature that can raise concern is rapid growth. Some phyllodes tumours can become large over a relatively short period. However, growth alone does not establish the diagnosis, because fibroadenomas can also enlarge.
Why Is a Rapidly Growing Breast Lump Important?
A lump that has been stable and then begins to grow significantly should be reassessed. Possible explanations include:
- Growing fibroadenoma
- Phyllodes tumour
- Hormonal change
- Another benign breast lesion
- Less commonly, another breast tumour
Do not assume that a lump is harmless simply because it was previously thought to be a fibroadenoma.
Can Ultrasound Tell the Difference?
Breast ultrasound is very useful for assessing a solid breast lump. It provides information about:
- Size
- Shape
- Margins
- Internal appearance
- Vascularity
- Relationship to surrounding tissue
However, fibroadenomas and phyllodes tumours can sometimes have overlapping ultrasound appearances, so ultrasound alone cannot always distinguish them with certainty.
What About Mammography?
Depending on the patient's age and clinical findings, mammography or 3D mammography may form part of the assessment. A phyllodes tumour can appear as a well-defined mass on mammography, but imaging alone may still not establish the final diagnosis.
Is a Core Needle Biopsy Needed?
A core needle biopsy may be recommended when a solid breast lesion requires tissue diagnosis. The biopsy allows a pathologist to examine the breast tissue under a microscope, which can often establish the diagnosis. However, there is an important limitation:
Fibroadenomas and phyllodes tumours can sometimes be difficult to distinguish even on core biopsy. This is because only a small portion of a larger lesion is sampled. A pathology report may use terminology such as “fibroepithelial lesion” when the distinction cannot be made confidently from the core samples alone.
What Does “Fibroepithelial Lesion” Mean on a Biopsy Report?
It means the biopsy shows a lesion containing both epithelial and stromal breast components. Fibroadenoma and phyllodes tumour are both fibroepithelial lesions. The term does not automatically mean cancer. Your breast specialist needs to consider the biopsy result together with:
- Imaging appearance
- Size
- Rate of growth
- Clinical examination
- Patient's age
- Whether pathology and imaging findings agree
Sometimes surgical removal is recommended to obtain the entire lesion for definitive diagnosis.
Does Every Fibroadenoma Need to Be Removed?
No. This is one of the major differences between the two conditions. A fibroadenoma with reassuring clinical, imaging and pathology findings can often be observed. Removal may be considered if it:
- Is growing substantially
- Is large
- Causes significant symptoms
- Produces breast asymmetry
- Has uncertain imaging or pathology findings
- Cannot be confidently distinguished from another fibroepithelial lesion
Does a Phyllodes Tumour Need Surgery?
Surgery is generally the main treatment for a phyllodes tumour. The goal is to remove the tumour completely with an appropriate margin of normal tissue, while preserving the breast whenever possible. The exact operation depends on:
- Tumour size
- Breast size
- Tumour location
- Pathology
- Whether the tumour is benign, borderline or malignant
- Whether it has previously recurred
Learn more about surgical oncology at The Breast Centre.
Does a Woman With a Phyllodes Tumour Need a Mastectomy?
Not automatically. Many phyllodes tumours can be treated with breast-conserving surgery. Mastectomy may be considered for very large tumours when adequate removal cannot reasonably be achieved while preserving the breast. Treatment should be individualized.
Can a Phyllodes Tumour Come Back?
Yes. Phyllodes tumours can recur locally after treatment. The risk varies according to factors including tumour pathology and adequacy of surgical excision. This is why appropriate surgery and follow-up are important.
Do Phyllodes Tumours Spread to Lymph Nodes?
Unlike typical breast carcinoma, malignant phyllodes tumours rarely spread through the lymph nodes. When they spread to distant parts of the body, they more commonly spread through the bloodstream. For this reason, routine axillary lymph-node surgery is generally not a standard part of treatment for an uncomplicated phyllodes tumour.
When Should a “Fibroadenoma” Be Reassessed?
Arrange reassessment if a previously diagnosed fibroadenoma:
- Is clearly increasing in size
- Begins growing rapidly
- Becomes very large
- Changes in character
- Produces increasing breast asymmetry
- Develops unusual imaging features
- Has a biopsy result that is not clearly concordant with imaging
Growth does not automatically mean that the lesion is a phyllodes tumour. It means the diagnosis and management should be reconsidered.
Phyllodes Tumour and Fibroadenoma Assessment in Vijayawada
At The Breast Centre, Vijayawada, a new or growing solid breast lump can be evaluated using an individualized approach. Assessment may include: clinical breast examination, breast ultrasound, mammography or 3D mammography when appropriate, core needle biopsy when indicated, correlation of imaging and pathology, and surgery when required.
The aim is to distinguish lesions that can be safely observed from those requiring tissue diagnosis or removal. Not sure who to see? Read when to see a breast specialist.
Book an appointmentCall +91 9100830830
Frequently Asked Questions
Is a phyllodes tumour the same as a fibroadenoma?
No. Both are fibroepithelial breast lesions and can look similar, but they have different biological behaviour and management.
Are most phyllodes tumours cancerous?
No. Most are benign. Phyllodes tumours are classified as benign, borderline or malignant.
Does a rapidly growing fibroadenoma mean cancer?
No. A rapidly growing breast lump has several possible explanations. However, significant growth is a reason to reassess the lesion.
Can ultrasound distinguish a fibroadenoma from a phyllodes tumour?
Sometimes imaging strongly favours one diagnosis, but there can be considerable overlap.
Can a core biopsy distinguish them?
Often, but not always. Some biopsy results are reported more generally as a fibroepithelial lesion because fibroadenoma and phyllodes tumour can overlap histologically.
Does every fibroadenoma need surgery?
No. Many fibroadenomas can be safely observed when the diagnosis is secure.
Does a phyllodes tumour require surgery?
Surgical removal is generally the main treatment for a diagnosed phyllodes tumour.
Does phyllodes tumour require lymph-node removal?
Routine axillary lymph-node surgery is generally not required because phyllodes tumours rarely spread through lymph nodes.
The Key Message
Fibroadenomas and phyllodes tumours can look and feel very similar. The important difference is their behaviour and management. Remember:
- Stable, confidently diagnosed fibroadenoma: often observation
- Growing or uncertain fibroepithelial lesion: reassessment
- Confirmed phyllodes tumour: usually surgical removal
If a breast lump that was previously called a fibroadenoma starts growing significantly, don’t panic, but don’t ignore the change. Have it reassessed.
Contact The Breast Centre, Vijayawada, for specialist assessment of a new, growing or previously diagnosed breast lump.
This information is for general education and does not replace individual medical advice, pathology interpretation, diagnosis or treatment.