Abstract
CONCLUSIONS: The rate of upper calyx rigid scope approachability through the lower calyx is significant higher in supine PCNL compared to prone PCNL. The possible anatomical explanation for this finding is the thinner body wall and muscular layer, as well as the lower muscle/fat ratio along the supine position tract. In addition, the angle between the upper calyx axis and the lower calyx tract is significantly wider in the supine position compared to the prone position. These measurements and findings may help in preoperative planning of PCNL and in deciding optimal patient positioning.
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