A 42-year-old woman presents with right upper quadrant pain radiating to the right scapula after a fatty meal. Ultrasound of the abdomen is performed. The structure marked B in the diagram shows a clean, sharply demarcated hypoechoic shadow extending posteriorly from a hyperechoic focus within the gallbladder lumen. Which of the following best explains the mechanism by which this acoustic finding is produced?

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