The hyperactive halo as a sign of renal graft death in 99mTc-DTPA studies.

In scintigraphic studies of renal transplants the absence of renal perfusion and clearance have been demonstrated to have many possible pathologic etiologies, vascular obstructions, and rejections. Increased perinephric activity was suggested as a sign of renal infarction and its absence may indicate potential renal viability. A case is presented in which a hyperactive halo was seen when the graft was dying.