Risk Factors of Tomaszewski et al for Urine Leak After Partial Nephrectomy

Patient selection: status post partial nephrectomy for urine leak

renal pelvic score = RPS =

= percentage of renal pelvis contained within renal parenchyma)

based on a line connecting the two polar lines on excretory phase images (see Figure 1).

If the renal pelvic score is > 50% then it is designated intraparenchymal, else extraparenchymal.

Risk factors for urine leak:

(1) intraparenchymal pelvis (OR 47.3)

(2) RENAL nephrotomy group (OR 3.2 per group: 4-6 vs 7-9 vs 10-12)

(3) surgical entry into collecting system (OR 23.9)

The risk of urine leak increases with type and number of risk factors present.