V6-08 LARGE UPPER-CALYX STONE: CAN SUPRA-TWELFTH PCNL APPROACH BE AVOIDED?

as duplicated systems and compound calyxes can be navigated with confidence. Radiography assisted navigation can augment visual navigation compromised by blood or debris. During percutaneous nephrolitotomy (PCNL), roadmapping allows more precise placement of the dilation balloon. CONCLUSIONS: This novel application of fluoroscopy can be applied whenever a pyelogram would be helpful. With additional experience and optimization of the technical aspects this can provide another tool for complex endourologic procedures. Future research will be needed to quantify the benefits in regards to operative success, operative time, and radiation exposure.