Thomas et al reported the Guy's Stone Complexity Scoring System for patients with nephrolithiasis. The authors are from Guy's and St. Thomas' National Health Service Foundation Hospital in London.
Patient selection: nephrolithiasis
Parameters:
(1) number of stones
(2) anatomy
(3) staghorn calculus
(4) concurrent findings
Parameters
Grade
single stone, pelvis, simple anatomy
I
single stone, mid or lower pole, simple anatomy
I
single stone, upper pole, simple anatomy
II
multiple stones, simple anatomy
II
single stone, abnormal anatomy
II
multiple stones, abnormal anatomy
III
stone(s) in calyceal diverticulum
III
partial staghorn calculus
III
staghorn calculus
IV
any stone in a patient with spina bifida or spinal injury
IV
The grade correlates with stone-free rate following percutaneous nephrolithotomy (PCNL).
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