Which descriptor indicates a structure that produces no internal echoes, appearing completely black?

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Multiple Choice

Which descriptor indicates a structure that produces no internal echoes, appearing completely black?

Explanation:
Echogenicity on ultrasound shows how much sound is reflected by a structure. Structures that produce no internal echoes are anechoic, so they appear completely black because the sound waves pass through with minimal reflection back to the transducer. This is typical of fluid-filled spaces, like a simple cyst or the lumen of the urinary bladder. In contrast, hyperechoic structures look very bright because they reflect many echoes; isoechoic structures have the same brightness as surrounding tissue; and hypoechoic structures are darker than surrounding tissue but not completely black.

Echogenicity on ultrasound shows how much sound is reflected by a structure. Structures that produce no internal echoes are anechoic, so they appear completely black because the sound waves pass through with minimal reflection back to the transducer. This is typical of fluid-filled spaces, like a simple cyst or the lumen of the urinary bladder. In contrast, hyperechoic structures look very bright because they reflect many echoes; isoechoic structures have the same brightness as surrounding tissue; and hypoechoic structures are darker than surrounding tissue but not completely black.

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