From: Stone-free rate after semirigid ureteroscopy with holmium laser lithotripsy versus laparoscopic ureterolithotomy for upper ureteral calculi: a multicenter study
Stone composition
Group A (URS)
N = 37
Group B (lap)
N = 30
P value
Ca oxalate monohydrate
9 (24.3%)
4 (13.3%)
0.489
NS
Ca oxalate dehydrate
10 (27%)
8 (26.7%)
Mixed stones
18 (48.6%)
18 (60%)
Total
37 (100%)
30 (100%)