Which description best fits the content of a simple breast cyst on ultrasound?

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A simple breast cyst on ultrasound is defined by being anechoic, meaning it appears completely black because it is fluid-filled and does not reflect sound. This lack of internal echoes indicates there are no solid components inside. You’ll also see posterior acoustic enhancement, where the area behind the cyst looks brighter due to the fluid allowing the ultrasound waves to pass with less attenuation. The wall is thin and well circumscribed, and there are no internal septations or debris.

The other descriptors don’t fit because hyperechoic with posterior shadowing would suggest a solid or calcified structure with attenuation, not a fluid-filled cyst. Isoechoic to fat would mean the cyst mirrors surrounding fatty tissue, which isn’t how fluid appears. Hypoechoic with debris implies internal echoes from debris or hemorrhage, characteristic of a complex cyst rather than a simple one.