Renogram Study With Percutaneous Nephrolithotomy (PERC): Alterations in Renal Blood Flow as a Consequence of PERC

Subjects who enroll in this study will undergo a nuclear scan called a renogram to assess renal function prior to surgery (baseline), approximately one hour after surgery (to assess percutaneous effects on renal function) and finally approximately 6 weeks post-operatively (to assess return to baseline).