Which structure is the most hyperechoic in the listed normal structures?

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On ultrasound, structures with fat and dense connective tissue reflect sound more strongly and appear brighter, or hyperechoic. The renal sinus sits at the center of the kidney and contains fat and fibrous tissue around the collecting system, so it stands out as the brightest normal structure. The liver and spleen are parenchymal organs with moderate echogenicity (the spleen often a bit brighter than the liver, but not as bright as the renal sinus), while the renal cortex is relatively less echogenic than the sinus, typically isoechoic to or slightly hypoechoic compared with the liver.