Objective To explore the effective microinjury method for treatment of renal calyceal stones.

CONCLUSION the anatomic anomalies of lower renal calyces is one of the primary factor affecting the curative effect of renal calyceal stones.

There was a large renal calculus (stone) that obstructed the calyces of the lower pole of this kidney, leading to a focal hydronephrosis (dilation of the collecting system).