Published: 2015-07-29

Cross fused ectopic kidney a rare congenital malformation with review of literature

Tanveer Parvez Shaikh, Sharique Ansari, Thahir VU, Nisha Mandhane, Sangram Karandikar


Crossed renal ectopia is one of the rarest urinary system anomalies. It is more often seen at autopsy than in clinical practice. Most cases of renal ectopia remain asymptomatic during life and are diagnosed incidentally. Renal ultrasonography, intravenous pyelography, computerized tomography, and renal scintigraphy (technetium-based tests) are the imaging methods used for diagnosis. Demonstration of crossed renal ectopia is important because it is a predisposing factor for obstruction, infection, and neoplasia of the urinary system. We report male patient who had unremarkable clinical findings. He had left-to-right inferior crossed renal ectopia with fusion. Surgeons should be aware of ectopic and fused kidneys to minimize perioperative complications because of the uncertain anatomy.


Crossed fused renal ectopia, Urinary system anomalies, Ureter, Embryology, Renal anomaly

Full Text:



Bauer BS. Anomalies of form and fusion, crossed renal ectopia with and without fusion. In: Alan J, eds. Wein: Campbell-Walsh Urology Book. 9th ed. Philadelphia: WB Saunders; 2007: 3269-3304.

Patel TV, Singh AK. Crossed fused ectopia of the kidneys. Kidney Int. 2008;73:662.

Meyers MA, Whalen JP, Evans JA, Viamonte M. Malposition and displacement of the bowel in renal agenesis and ectopia: new observations. Am J Roentgenol Radium Ther Nucl Med. 1973;117:323-33.

Dähnert W. Urogenital tract: anatomy and function of urogenital tract: developmental renal anomalies. In: Dähnert W, eds. Dänhert-Radiology Review Manual. 4th ed. Phoenix: Lippincott Williams and Wilkins; 1999: 2446.

Yuksel A, Batukan C. Sonographic findings of fetuses with an empty renal fossa and normal amniotic fluid volume. Fetal Diagn Ther. 2004;19:525-32.

Goodman JD, Norton KI, Carr L, Hsu-Chong Y. Crossed fused renal ectopia: sonographic diagnosis. Urol Radiol. 1986;8:13-6.

Warkany J, Passarge E, Smith LB. Congenital malformations in autosomal trisomy syndromes. Am J Dis Child. 1966;112:502-17.

Abeshouse BS, Bhisitkul I. Crossed renal ectopia with and without fusion. Urol Int. 1959;9:63-91.

Mininberg DT, Roze S, Pearl M. Hypertension associated with crossed renal ectopia in an infant. Pediatrics. 1971;48:454-7.

Kramer SA, Kelalis PP. Ureteropelvic junction obstruction in children with renal ectopy. J Urol (Paris). 1984;5:331-6.

Guarino N, Tadini B, Camardi P, Silvestro L, Lace R, Bianchi M. The incidence of associated urological abnormalities in 57 children with renal ectopia. J Urol. 2004;172:1757-9.