Selected images (labelled in French) of a 1 month post-operative follow-up renal transplant Doppler study.
The transplant shows normal echogenicity with good corticomedullary differentiation. No hydronephrosis.
Slight enlargement compared to previous studies of two perinephric fluid collections.
The kidney graft shows homogeneous vascularity on power Doppler. Renal arterial resistive index are slightly elevated since last exam, varying between 0.62 and 0,76 (previously maximally 0,70; not shown). The intra-renal arterial curves also have a slightly delayed systolic upstroke.
The renal vein is permeable, with proper respiratory variability.
The renal transplant artery anastomosis shows aliasing on color Doppler, despite proper imaging parameters with scale set to maximum. Spectral Doppler shows spectral broadening (increased spectral ranges under the curve) and velocity acceleration up to 623 cm/s. The adjacent external iliac artery has a normal spectral curve and maximum velocity of 105 cm/s. There is therefore nearly a 6:1 ratio between the transplant artery and external iliac. These findings are diagnostic for transplant renal artery stenosis.