A galactocele is a benign, milk-filled cyst that commonly occurs during pregnancy or lactation.
Although it may feel alarming, a galactocele is not cancer and is usually harmless.
Understanding its ultrasound features and clinical behavior helps differentiate it from other breast masses.
What Is a Galactocele?
A galactocele forms when a milk duct becomes obstructed, leading to accumulation of milk.
It most often appears:
- During late pregnancy
- During breastfeeding
- Shortly after cessation of lactation
It is one of the most common benign breast masses in lactating women.
Ultrasound Features of Galactocele
On breast ultrasound, a galactocele may appear:
- Well-circumscribed
- Round or oval
- Cystic or complex cystic
- With internal echoes due to milk components
- With posterior acoustic enhancement
The internal echogenicity can vary depending on the fat and protein content of the milk.
Fluid-fluid levels may sometimes be visible.
Recognition of these features is important to avoid unnecessary biopsy.
How Is Galactocele Different from Other Breast Masses?
Galactocele should be differentiated from:
- Fibroadenoma
- Lactating adenoma
- Abscess
- Pregnancy-associated breast cancer
Unlike solid tumors, galactoceles are typically cystic and show posterior enhancement.
Clinical history of lactation is a key diagnostic clue.
When Is Aspiration Needed?
Aspiration may be considered if:
- The mass is painful
- There is diagnostic uncertainty
- The cyst is large or causing discomfort
Fine-needle aspiration often yields milky fluid and confirms the diagnosis.
Is Galactocele Dangerous?
Galactocele is a benign condition.
It does not increase breast cancer risk.
Most cases resolve spontaneously after lactation ends.
However, persistent or atypical findings should be evaluated carefully.
Counseling Perspective
Patients often fear that any breast mass during pregnancy or breastfeeding means cancer.
It is helpful to explain:
- Galactocele is common during lactation
- Ultrasound findings are usually characteristic
- Most cases require no surgery
Clear explanation reduces unnecessary anxiety.
