Which term describes tissue with fewer echoes than surrounding tissue?

Study liver anatomy and function with our medical students test. Engage with detailed multiple choice questions, each with hints and explanations. Prepare effectively for your test!

Echogenicity is about how much tissue reflects the ultrasound waves. Tissue that returns fewer echoes than the surrounding tissue appears darker on the image—this is called hypoechoic. In other words, it’s less reflective relative to its neighbors. The liver parenchyma has a certain baseline brightness, so a region that looks darker than that surrounding liver is described as hypoechoic. By contrast, anechoic means no echoes at all (completely black, like a simple cyst), hyperechoic means brighter than the surrounding tissue, and isoechoic means it has about the same brightness as its surroundings. This concept helps identify and characterize regions within the liver on ultrasound.