CHAPTER 95: Parenchymal Imaging

Computed tomography of a normal transplant kidney in the left lower quadrant (Figure 95-1). On the corticomedullary phase the extrarenal pelvis (blue arrow) could be potentially misinterpreted as a cystic lesion or a perirenal fluid collection (Figure 95-2). The excretory phase shows filling with excreted opacified urine (yellow arrow) confirming a normal finding. Notice the donor renal vein joining to the recipient left external iliac vein (green arrow).

Computed tomography of a normal transplant kidney in the left lower quadrant (Figure 95-1). On the corticomedullary phase the extrarenal pelvis (blue arrow) could be potentially misinterpreted as a cystic lesion or a perirenal fluid collection (Figure 95-2). The excretory phase shows filling with excreted opacified urine (yellow arrow) confirming a normal finding. Notice the donor renal vein joining to the recipient left external iliac vein (green arrow).

Renal allograft cysts (green arrows). Transplanted kidneys may contain cysts. It is important to determine prior to transplantation that such cysts have no current or potential malignancy. When in doubt, a magnetic resonance imaging of the kidneys or a biopsy should always be obtained. These findings have to be thoroughly discussed with the potential recipient prior to implantation.

Renal allograft cysts (green arrows). Transplanted kidneys may contain cysts. It is important to determine prior to transplantation that such cysts have no current or potential malignancy. When in doubt, a magnetic resonance imaging of the kidneys or a biopsy should always be obtained. These findings have to be thoroughly discussed with the potential recipient prior to implantation.

Serial images illustrating increasing resistive index (RI) on consecutive days—diagnosis of acute tubular necrosis confirmed by biopsy.

RI=peak systolic (PSV)−end diastolic velocity (EDV)peak systolic velocity (PSV)

Serial images illustrating increasing resistive index (RI) on consecutive days—diagnosis of acute tubular necrosis confirmed by biopsy.

RI=peak systolic (PSV)−end diastolic velocity (EDV)peak systolic velocity (PSV)

Images from a ^99mTc-MAG3 renal scan allograft with acute tubular necrosis. There is renal cortical uptake of tracer but no excretion.