[A case report of crossed renal ectopia with renal stone].

Crossed renal ectopia is a relatively rare renal anomaly. A 49-year-old man with macrohematuria and right flank pain was admitted to our hospital. Various urological examinations were carried out, and a diagnosis of left crossed renal ectopia with renal stone was made. Pyelolithotomy was performed and stone analysis revealed a calcium oxalate. In Japan, 166 cases of crossed renal ectopia have been reported and 15 of them including our case were associated with urinary tract stones.