PMC

Renal parenchymal CT attenuation on the non-contrast CT scans versus intravascular contrast material volume. Larger volumes of administered contrast material correlated with increased persistent enhancement of the renal parenchyma (r = 0.23, p<0.001)

Three patterns of persistent renal enhancement observed at the delayed non-contrast CT. A) Global distribution without corticomedullary differentiation; B) Cortical distribution with clear distinction between enhanced renal cortices and un-enhanced renal medulla; C) Striated distribution with wedge-shaped enhancing and hypoenhancing segments.

Persistent non-contrast abdominal CT scans from selected patients in the contrast-induced nephropathy group. Each patient received either intra-arterial or intravenous iodixanol previously. Refer to for specific procedural and patient information. A) Patient No. 2 with cortical contrast retention; B) Patient No. 3 with global enhancement; C) Patient No. 5 with striated pattern; D) Patient No. 7 with cortical retention; E) Patient No. 11 with cortical retention; F) Patient No. 12 with striated pattern

Graph of renal parenchymal CT attenuation at non-contrast CT scans obtained for each day after intravenous or intra-arterial iodixanol administration. A shorter elapsed time between intravascular contrast administration and subsequent non-contrast CT correlated with increased magnitude of delayed renal enhancement (r = −0.30, p < 0.001). Also, while intra-arterial administration of contrast material showed a greater magnitude of delayed renal enhancement than did intravenous for each day of time lapse, multivariate analysis () showed that this difference was not statistically independent from the volume of contrast material that was administered.