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Table 2 Classification of 62 patients according to the GSS

From: Totally tubeless single access tract mini-percutaneous nephrolithotripsy in treatment of large burden > 2-cm and/or complex renal stones: a case series of 62 patients

GSS The patients stratified according to the Guy’s Stone Score No. (%)
GS I A solitary stone in the mid pole with normal anatomy 1 (2)
N = 21 A solitary stone in lower pole with normal anatomy 6 (10)
  A solitary stone in the renal pelvis with normal anatomy 14 (23)
GS II Multiple stones in a patient with simple anatomy 12 (19)
N = 15 A solitary stone in a patient with abnormal anatomy 1 (2)
  A solitary stone in the upper pole 2 (3)
GS III Partial stag horn calculus 21 (34)
N = 22 Stone in calyceal diverticulum 1 (2)
GS IV A complete stag horn calculus 4 (6)
N = 4   
  1. GSS: Guy’s Scoring System
  2. GS: Guy score