Breast Screening & Diagnostic Practice Test

Interpreting breast cysts on ultrasound hinges on what the content looks like and whether there is blood flow. A simple cyst is completely anechoic, with thin walls and posterior acoustic enhancement, and it has no internal echoes or vascularity. When a cyst shows internal echoes but there are no solid components and no Doppler flow, the description used is a complicated cyst. The internal echoes come from debris, proteinaceous material, or inspissated secretions inside the fluid, which means it’s not a straightforward simple cyst, but there’s still no solid tissue or blood supply to raise concern. A complex cyst would imply more concerning features like thick walls, septations, or a true solid component, which aren’t present here. A hemorrhagic cyst can also have internal echoes, but the hallmark in this scenario is debris within an otherwise non-solid cavity without vascularity, fitting the label of a complicated cyst.