The authors present a case of delayed allograft renal vein thrombosis
associated with compression from a perirenal transplant lymphocele. Re
altime and Doppler ultrasound diagnosed thrombus within an enlarged re
nal transplant vein, high vascular impedance with absent venous signal
s, and a peritransplant lymphocele. The graft function was restored fo
llowing percutaneous drainage of the lymphocele and anticoagulation th
erapy.