Percutaneous Nephrolithotomy in a Patient with Cross-Fused Renal Ectopia.

Cross-fused renal ectopia (CFRE) is a rare congenital anomaly in which an ectopic kidney crosses the midline and merges with the orthotopic kidney on the other side. Patients with CFRE could present with urolithiasis. The abnormal anatomy and the lack of consensus to treat urolithiasis in these cases present challenges to treatment. In this study, we present a case of renal stone in a CFRE managed through percutaneous nephrolithotomy (PCNL). We present a case of a 59-year-old man with right flank pain. Radiologic studies showed a 2 cm renal pelvis stone in a CFRE. The patient was effectively managed with PCNL. With proper radiologic study and thorough understanding of the aberrant anatomy, PCNL represents a safe and effective treatment for patients with renal stones in CFRE with high stone-free rate and low mortality.