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[The MRT and MRA of kidney transplants--vascular and perfusion assessment]
W Wiesner1, T Pfammatter, G P Krestin
1Institut für Diagnostiche Radiologie, Universitätsspital Zürich.
Purpose:
To document the value of fast contrast enhanced-sequences in the assessment of the vascular supply and parenchymal perfusion in renal transplants.
Patients:
18 recipients of a renal transplant were examined with a 1.5-tesla-MR-system. The protocol included fast contrast enhanced 3D MR angiography and coronal 2D GRE sequences. The transplant artery and vein were assessed as well as regional parenchymal perfusion.
Results:
3D MRA detected three transplant artery stenoses and one occlusion. In addition, two renal vein thromboses and one compression were identified. Perfusion deficits were documented in 8 renal transplants: renal infarction (n = 4), cortical necrosis (n = 2), acute tubular necrosis (n = 1) and venous ischemia (n = 1). Fluid collections were documented as well as dilation of the collecting system and abnormalities of the surrounding tissues.
Conclusion:
Contrast enhanced MRI and MRA permit a comprehensive assessment of renal transplants without inducing nephrotoxicity.