1, Most kidney stones at calyceal renal pelvis, the renal parenchyma rare stones.

2, Purpose:To investigate the effect of ESWL on renal calyceal stones.

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

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

5, In this case, a large " staghorn " calculus (so named because the prominent projections of the stone into the calyces resemble deer antlers) was present that filled up the pelvis and calyceal system.

6, A large staghorn calculus is seen obstructing the renal peli - calyceal system.