Clinical Outcomes of Percutaneous Nephrolithotomy Following Retrograde Percutaneous Nephrostomy Access Using Novel Device in Comparison to Antegrade Access

this will consist of one visit to a urologist for retrograde nephrostomy placement using a Retroperc device with lithotomy performed in the same visit and follow up at 4 weeks and 6 months.

this will consist of two visits, first to the interventional radiologist for antegrade nephrostomy placement followed by another visit to the urologist for lithotomy with follow up at 4 weeks and 6 months