Fluid-filled structures have what regarding internal echoes?

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Multiple Choice

Fluid-filled structures have what regarding internal echoes?

Explanation:
Fluid-filled structures are anechoic on ultrasound, meaning there are no internal echoes. This happens because fluid transmits sound with little reflection, so the interior looks completely dark. You may also see posterior acoustic enhancement behind the fluid due to its low attenuation. If there were particles or walls inside, you'd start to see internal echoes or a brighter area, indicating it’s not a simple fluid-filled structure.

Fluid-filled structures are anechoic on ultrasound, meaning there are no internal echoes. This happens because fluid transmits sound with little reflection, so the interior looks completely dark. You may also see posterior acoustic enhancement behind the fluid due to its low attenuation. If there were particles or walls inside, you'd start to see internal echoes or a brighter area, indicating it’s not a simple fluid-filled structure.

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