Comprehensive and Detailed Explanation From Exact Extract:
When sound passes through a structure that attenuates less than surrounding tissue (e.g., fluid-filled cyst), more sound reaches the tissues behind it, causing them to appear brighter. This artifact is called enhancement (or posterior acoustic enhancement).
According to sonography instrumentation reference:
“Posterior enhancement appears as increased echogenicity distal to a weakly attenuating structure due to greater beam intensity reaching deeper tissues.”
Therefore, the correct answer is A: Enhancement.
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