“…Varying grades of transplant Polyomavirus infection were marked with significant increases of cortical tissue perfusion [21]. In another study, we found in children a marked decline of cortical perfusion in allograft cortices beginning already one year after transplantation [22] while the pulsatility of cortical perfusion rose significantly [23]. Recently, it was shown, that intrinsic donor-derived factors are associated with GFR and cortical parenchymal perfusion intensity, measured by DTPM, but not the RI of segmental arteries in renal allografts [24].…”