The Modified Seoul National University Renal Stone Complexity (S-ReSC) Score can be used to describe the surgical complexity prior to nephrolithotomy.
Patient selection: nephrolithiasis prior to retrograde intrarenal surgery
Outcome: (1) no stones; or (2) non-symptomatic, non-obstructing, and non-infectious stone fragments < 4 mm in diameter
Involvement is binary, irrespective of number of stoones or sizze.
|
Site
|
Designation
|
Points
|
|
pelvis
|
1
|
1
|
|
superior major calyceal group
|
2
|
1
|
|
inferior major calyceal group
|
3
|
2
|
|
anterior superior minor calyceal group
|
4-5
|
1
|
|
posterior superior minor calyceal group
|
4-5
|
1
|
|
anterior middle minor calyceal group
|
6-7
|
1
|
|
posterior middle minor calyceal group
|
6-7
|
1
|
|
anterior inferior minor calyceal group
|
8-9
|
2
|
|
posterior inferior minor calyceal group
|
8-9
|
2
|
total score =
= SUM(points for all of affected sites)
Interpretation:
• minimum score: 1 (0 would indicate no stones)
• maximum score: 12
|
Score
|
Complexity Group
|
Stone-Free Rate
|
|
1 or 2
|
low
|
94%
|
|
3 or 4
|
medium
|
84%
|
|
5 to 12
|
high
|
46%
|
Performance:
• The area under the ROC curve is 0.81.
