What are clustered microcysts?
Clustered microcysts refer to a group of very small cysts clustered together in the breast tissue.
On ultrasound, they may sometimes appear similar to a small mass, which can cause concern during the examination.
However, in most cases, clustered microcysts are benign findings.
Clustered microcysts are commonly associated with fibrocystic change, a very common benign condition of the breast.
Ultrasound Features
Typical ultrasound findings include:
- multiple tiny anechoic cysts
- thin septations between cysts
- well circumscribed margin
- posterior acoustic enhancement
Because several small cysts are grouped together, the lesion may look like a small complex cystic area.
BI-RADS Assessment
Clustered microcysts are usually categorized as:
BI-RADS 2 (Benign)
Sometimes, depending on imaging appearance:
BI-RADS 3 (Probably benign)
Short interval follow-up may be recommended if the appearance is not classic.
Why do clustered microcysts occur?
They are commonly related to hormonal changes in the breast.
Clustered microcysts are often seen in women in their 30s to 50s, especially in those with fibrocystic breast changes.
These cysts may fluctuate with the menstrual cycle.
Key Point for Patients
Seeing clustered microcysts on ultrasound does not mean breast cancer.
They are a very common benign finding, and most cases simply require routine follow-up.
Key Point for Sonographers
When multiple small cysts form a cluster:
Possible report descriptions include:
- clustered microcysts
- small grouped cysts
- fibrocystic change with multiple microcysts
Careful evaluation should confirm the absence of solid components or suspicious features.
Clustered microcysts are noted in the left breast,
showing multiple small anechoic cysts with thin septations.
No solid component is identified.
