What does sonolucent mean?

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Sonolucent describes how something looks on ultrasound in terms of echo production. It means the area transmits sound with little to no reflection, so there are no internal echoes and the structure appears uniformly dark on the image. This is typical of simple fluid-filled spaces like a cyst, where the fluid lets sound pass through easily and doesn’t reflect it back. So the best description is “without echoes.”