Enlarged photon-deficient area in expected site of renal allograft on Tc-99m DTPA study. A sign of renal vein thrombosis

Two Different Causes of Decreased Activity on Ipsilateral Iliac Artery in Renal Transplant Scintigraphy

In 2 patients, perfusion images of renal transplant scintigraphy showed similarly decreased activity on ipsilateral iliac artery. One's graft was photopenic because of arterial thrombosis. However, the other's graft had sufficient perfusion and no abnormality in iliac arteries, but he had femoral arteriovenous graft for hemodialysis on the contralateral side. So, in this patient, decreased activity on ipsilateral iliac artery was probably related to increased arterial flow of the contralateral side. It should be considered that decreased activity on ipsilateral iliac artery in perfusion images is not only due to ipsilateral problem; the cause could be on the contralateral side.