DIAGNOSIS: Ureteropelvic Junction (UPJ) Obstruction
EXAM: Nuclear Medicine Renal Lasix Scan
INDICATION: 62-day-old with hydronephrosis
TECHNIQUE: Nuclear medicine renal flow and function study was performed. 1.04 mCi of Tc-99m MAG-3 was administered intravenously and posterior blood flow imaging of the kidneys was performed. Serial posterior images were then obtained up to 40 minutes. 1.1 mg of Lasix was administered intravenously at 20 minutes. Quantification of renal flow and function before and after Lasix was performed.
SPLIT RENAL FUNCTION:
Left: 74%
Right: 26%
TIME TO PEAK ACTIVITY:
Left: 6 minutes
Right: 1 minutes
CLEARANCE HALF-TIME:
Left Kidney: 3 minutes post-Lasix
Right Kidney: Not obtained at 20 minutes post-Lasix
FINDINGS:
Prompt left renal perfusion and function. Prominence of the collecting system without obstruction.
Abnormal right renal function with a dilated collecting system. No discernible clearance at 20 minutes post Lasix.
IMPRESSIONS:
Poorly functioning and hydronephrotic right kidney with UPJ obstruction.
Left pelvicaliectasis without obstruction.
