54-year-old female with right renal mass who presents for evaluation of differential function. The posterior abdominal radionuclide angiogram demonstrates absent perfusion involving a region within the superior pole of the right kidney, which likely corresponds to the mass identified on recent MRI. On sequential imaging, there is a lack of uptake within this region as well. There is normal uptake and excretion of tracer within the left kidney and lower pole of the right kidney. The estimated contribution of the right kidney to total renal function is 44% and that of the left kidney is 56%. There are no abnormalities of the ureters or bladder.
Area of decreased perfusion, uptake, and excretion within the superior pole of the right kidney likely corresponds to the mass identified on recent MRI. Normal perfusion, uptake, and excretion of the left kidney and lower pole the right kidney.