Persistent nephrograms occur when intravenous contrast media is retained by both kidneys for more than 3 minutes.
Terminology
Persistent nephrograms are characteristically bilateral and are usually distinguished from delayed nephrograms, which occur unilaterally.
Pathology
Etiology
-
systemic hypotension
- can be a feature of CT hypoperfusion complex
- bilateral intrarenal obstruction
- acute tubular necrosis
- acute urate nephropathy
- vascular causes
- bilateral renal artery stenosis
- bilateral renal vein thrombosis
- bilateral obstructive uropathy
- others
- proteinuria - myeloma kidney
- contrast nephropathy
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