There are several types of fibroadenomas, including:
- Simple Fibroadenoma: This is the most common type of fibroadenoma, accounting for about 75% of all fibroadenoma cases. They typically occur in women between the ages of 15 and 35. It typically presents as a single lump that is round or oval-shaped with a well-defined border. It is often discovered during a routine breast exam or mammogram. Simple fibroadenomas do not typically require treatment, but your doctor may recommend monitoring it over time to make sure it does not change in size or shape.
- Giant Fibroadenoma: This is a type of simple fibroadenoma, but is larger than 5 centimeters in diameter. While giant fibroadenomas are still benign, they can be concerning due to their size and may cause discomfort or cosmetic concerns. Treatment may include removal of these lumps, especially if it is growing or causing discomfort. This type of fibroadenoma is rare, accounting for only 0.5% to 2% of all fibroadenomas. It is more common in younger women and can grow quickly, sometimes reaching a size of 10 centimeters or more.
- Complex Fibroadenoma: This type of fibroadenoma has additional features that can be seen under the microscope, such as presence of cysts, calcifications, or abnormal cell growth. Complex fibroadenoma is a rare entity, accounting for only 0.5% to 2% of all fibroadenomas. It is more common in younger women and can grow quickly. While still benign, a complex fibroadenoma can be more difficult to distinguish from a phyllodes tumor, which is a rare type of breast tumor that can be malignant. Therefore, your doctor may recommend you for a biopsy to confirm the diagnosis and rule out the possibility of a phyllodes tumor.
- Juvenile Fibroadenoma: This type of fibroadenoma occurs in adolescent girls and young women under the age of 25. It is usually smaller than a typical fibroadenoma and often disappears on its own without any medical intervention. However, if it causes pain or continues to grow, it may need to be removed. They account for about 10% to 20% of all fibroadenomas.
- Multiple Fibroadenomas: When a woman has two or more fibroadenomas in one or both breasts, it is known as multiple fibroadenoma. This is a relatively uncommon condition, occurring in less than 10% of women with fibroadenomas. While multiple fibroadenomas are not necessarily a cause for concern, it may be helpful to monitor them for changes in size and shape over time. Your doctor may also recommend you a biopsy if there are any concerning issues or if the fibroadenomas are causing discomfort or growing rapidly.
It is crucial to understand that while fibroadenomas are benign, they can sometimes be mistaken for other types of breast tumors, so it is always essential to consult a doctor if you notice a lump or other changes in your breast.
- American Cancer Society: https://www.cancer.org/cancer/breast-cancer/non-cancerous-breast-conditions/fibroadenomas-of-the-breast.html
- Mayo Clinic: https://www.mayoclinic.org/diseases-conditions/fibroadenoma/symptoms-causes/syc-20352737
- National Breast Cancer Foundation: https://www.nationalbreastcancer.org/breast-cancer-fibroadenomas
- Radiopaedia: https://radiopaedia.org/articles/fibroadenoma-1