In an adult, the renal cortex should generally be similar to or slightly darker (less echogenic) than the spleen.

From this single photograph, the kidney cortex appears roughly isoechoic to mildly hypoechoic relative to the visible splenic tissue, which can be within normal limits. I do not see an obvious markedly bright renal cortex compared with the spleen in this image.

However, this cannot be assessed reliably from a photographed single frame because gain, depth, focal zone, and different image settings can change apparent brightness. A proper comparison needs real-time ultrasound views with the kidney and spleen imaged using matched settings, plus cortical thickness, kidney size, corticomedullary differentiation, and the written report.

For reference, normal adult renal cortex is isoechoic or hypoechoic relative to liver or spleen; increased cortical echogenicity can suggest parenchymal renal disease but is nonspecific. Comprehensive Clinical Nephrology, 7th Edition, p. 3115-3117.

This image appears to show the renal cortex as slightly less echogenic (darker) than the adjacent splenic-appearing parenchyma, which is the expected adult pattern and is not obviously abnormally echogenic.

A limitation is that the kidney and spleen are not clearly displayed side-by-side in the same matched view, and the left panel may instead use liver as the acoustic window. Therefore, a definitive assessment should rely on the full ultrasound examination and report, including renal size, cortical thickness, and corticomedullary differentiation.

Normal adult renal cortex is usually less echogenic than the spleen. Brenner and Rector's The Kidney, 2-Volume Set, Ultrasonography: Normal Anatomy, lines 1696-1700.