Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Normal, still hyperechoic kidney of a preterm infant; b Tamm–Horsfall kidney; c medullary nephrocalcinosis (NC) grade I (mild increase of echogenicity around the pyramidal border); d medullary NC grade II (mild increase of echogenicity at whole pyramid); e medullary NC grade III (more severe hyperechogenicity of entire pyramid); f diffuse corticomedullary NC [6]
