Many patients become anxious when they hear
“multiple nodules” on breast ultrasound.
However, not all nodules are dangerous.
This case represents:
👉 Fibrocystic change (FCC)
👉 Especially clustered microcysts
🔍 Why do they look like a mass?
Ultrasound shows only a slice at a time.
👉 Multiple small cysts may appear as
a single solid-looking lesion (pseudo-solid appearance)
📊 Key Features of Clustered Cysts
- Multiple small cysts grouped together
- Smooth margins
- Hypoechoic or anechoic
- Posterior acoustic enhancement
- No internal vascularity
👉 These features strongly suggest benignity
❗ How to differentiate from cancer?
| Feature | Clustered cyst | Malignancy |
| Shape | Round/oval | Irregular |
| Margin | Smooth | Spiculated |
| Orientation | Parallel | Taller-than-wide |
| Posterior | Enhancement | Shadowing |
| Vascularity | None | Often present |
📌 Final Impression
👉 Fibrocystic change with clustered cysts
👉 BI-RADS 2 (benign)
“Clustered cysts can mimic a solid mass on ultrasound. Always evaluate in multiple planes.”
