Which of the following describes the characteristics of a simple cyst?

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A simple cyst on ultrasound is a round or oval, thin-walled, fluid-filled structure that is completely anechoic—appearing completely black because there are no internal echoes. It also typically shows posterior acoustic enhancement, since fluid attenuates sound less than surrounding tissue. It should have smooth, well-defined borders and be unilocular with no septations, solid components, or calcifications. The description that matches this best is a round or oval shape with a thin wall and anechoic interior. Descriptions mentioning irregular shape with internal echoes, multiloculations with septations, or calcifications point to more complex or different types of lesions rather than a simple cyst.