What is the meaning of having bilateral renal cortical scarring and increased cortical reflectivity?

the right kidney measures 9.3x3.6cm and left kidney measures 9.1x4 cm both kidneys reveal cortical scarring and increased cortical reflectivity.Coricomedullary differentiation is maintained.Ureters are not dilated.Urinary bladder doesnot reveal any intrinsic lesion.Prostate is normal in size.Comment:Bilateral renal cortical scarring and increased cortical reflectivity.