a cortical attenuation of 55-110 hu on a 24-hour postcontrast scan may help identify a group of patients with subclinical renal impairment who are at high risk of nephropathy on subsequent exposure to contrast medium , while cortical attenuations in excess of 140 hu seem to be an early indicator of contrast nephropathy .
C0035078
renal impairment
C0022658
nephropathy