69-year-old male with history of right kidney mass. Please assess left kidney function. The posterior abdominal radionuclide angiogram demonstrates heterogeneous flow into the right renal fossa, correlating with known right renal mass from prior outside MRI. There is prompt perfusion of the left kidney. Sequential renal images show the left kidney to be of normal size and morphology. There is prompt uptake but delayed excretion of the radiopharmaceutical by the left kidney. There are no abnormalities of the left ureter or bladder.Following administration of the diuretic, there was prompt washout of collecting system radiotracer into the bladder without evidence of current obstruction. However, some cortical activity persisted after diuretic administration for the remainder of the study. The T1/2 washout from the left collecting system was 19 minutes.
1.Normal perfusion and uptake but delayed excretion by the left kidney. Clearance of radiotracer from collecting system with persistent cortical activity after diuretic administration suggests medical renal disease without obstruction.2.Lack of right renal function with heterogeneous perfusion into right renal fossa on angiographic phase, compatible with known mass in this location. 