Which is more echogenic than the liver in the listed comparison?

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Understanding what echogenicity means helps here: it’s about how bright a structure appears on ultrasound. The liver parenchyma in a normal exam has a moderate level of brightness and is not typically outshined by the other listed solid abdominal organs. The renal cortex and the spleen do not consistently appear brighter than the liver in a normal study, so there isn’t an organ among the options that is more echogenic than the liver. That’s why “nothing listed” is the best choice. Keep in mind that changes like fatty liver can increase the liver’s brightness, which would further reinforce that no other listed structure is brighter in a normal comparison.