DYNAMIC RADIONUCLIDE RENAL IMAGING WITH LASIX 

DATE: 5/1/2006

PROCEDURE: After bolus IV injection of radiopharmaceutical, dynamic posterior projection images of the kidneys were acquired over a total of 31 minutes at: 2 sec/frame x 30 frames, 60 sec/frame x 30 frames. After IV injection of Lasix, additional 60 sec/frames x 20 frames were obtained. 

RADIOPHARMACEUTICAL: Tc 99m MAG3 

RADIOPHARMACEUTICAL DOSE: [10] mCi 

COMPARISON: None 

CLINICAL HISTORY: The patient is a [...]-year-old [fe]male with a history of [...]. The patient is referred for evaluation of renal function and obstruction. 

FINDINGS: 

The blood perfusion images show prompt tracer in both renal fossae, consistent with normal renal perfusion. 

Extraction, excretion and clearance apppear normal for the right kidney. 

The extraction and excretion appears mildly compromised for the left kidney. 

Significant pooling of tracer is noted in the left renal collecting system. 

After injection of Lasix, there is good clearance of tracer activity from the left collecting system, consistent with normal response to Lasix. 

The differential renal function is [...]% (left) and [...]% (right). 

CONCLUSIONS: 

1. The right kidney shows normal perfusion and normal renal function and clearance. 

2. The left kidney shows normal perfusion and mildly compromised function. Pooling of tracer in the collecting system clears after the administration of Lasix, consistent with no significant obstruction.

3. The differential renal function is [...]% (left) and [...]% (right) (a difference of up to 45/55% is considered normal). 

Thank you for referring this patient to the UCLA Nuclear Medicine Clinic. 

I, [...], M.D., Ph.D., have reviewed this Nuclear Medicine study personally, and am in full agreement with the findings of the report presented here.