Presentation
Recurrent flank pain. Recurrent left PUJ obstruction. Pyeloplasty 7 years earlier, known capacious left renal pelvis.
Patient Data
TECHNIQUE
Tc99m-MAG3 was administered via IV cannula.IV frusemide was administered immediately prior to the imaging protocol start. Dynamic and planar imaging was performed.
FINDINGS
Kidneys are in normal position. Normal symmetric renal perfusion bilaterally. Normal bilateral cortical radiotracer uptake. Bilateral central photopenia secondary to prominent renal pelvis, more on the left.
Radiotracer demonstrated within the renal pelvis by 60 seconds. The left renal pelvis is slightly prominent compared to the right.
Normal emptying of radiotracer from the upper urinary tract and ureters.
Normal frusemide clearance half times of 7 minutes on the left, and 4 minutes on the right (normal < 10 minutes).
The differential renal function at 2-3 minutes is symmetrical at 50% on the left and 50% on the right.
IMPRESSION
- No functionally significant renal outflow tract obstruction.
- Normal split renal function of 50% on each side.
Case Discussion
MAG3 radiotracer has tubular excretion in the kidney and is used as a test for renal tract obstruction. This is a case of a normal MAG3 study.