What is the key ultrasound feature that distinguishes a complicated breast cyst from a complex breast cyst?

What is the key ultrasound feature that distinguishes a complicated breast cyst from a complex breast cyst?

• A. Presence of solid components
• B. Size larger than 2 cm
• C. Absence of any internal echoes
• D. Peripheral vascularity only

Answer: (A)

The key ultrasound feature is the presence of a solid component inside the cyst. A complicated breast cyst shows internal echoes due to debris or other non-solid material but remains fluid-filled with no true solid tissue. A complex cyst, by contrast, contains an intracystic solid element such as a mural nodule, thickened or irregular walls, or septations, and may exhibit vascularity within the solid part. This solid component is why a complex cyst is distinguished from a complicated one and raises greater concern for an intracystic lesion that may require further evaluation.

The key ultrasound feature is the presence of a solid component inside the cyst. A complicated breast cyst shows internal echoes due to debris or other non-solid material but remains fluid-filled with no true solid tissue. A complex cyst, by contrast, contains an intracystic solid element such as a mural nodule, thickened or irregular walls, or septations, and may exhibit vascularity within the solid part. This solid component is why a complex cyst is distinguished from a complicated one and raises greater concern for an intracystic lesion that may require further evaluation.