摘要To the Editor:Percutaneous nephrolithotomy (PCNL) is first-line therapy for "staghorn" stones.A multi-access approach is the mainstay of treatment in many cases because the stone burden is high.Finding feasible parameters to predict the outcome of treatment for staghorn stones is important.The factors that can affect PCNL are controversial.Several parameters,such as the infundibular-pelvic angle (IPA),upper-lower calyx angle (ULCA),infundibular length (IL),and infundibular width (IW) were important to affect the result of the operation.Whether the objective parameters in computed tomography (CT) can predict success through a particular approach has not been evaluated.This study investigated if the anatomy of the collecting system could improve the outcome in selected patients according to pretreatment images.