Poor renal perfusion
Nephrotoxic medications
Contrast induced allergic reaction<unk> 
CT contrast media extravasation
Nephrogenic Systemic Fibrosis - gadolinium in GFRs < 60
Contrast-induced nephropathy
Poor renal perfusion
IgA nephropathy
Nephrotoxic medications
Emphysematous pyelonephritis
Contrast induced allergic reaction
Post-streptococcal glomerular nephritis
Ureteral stent complications