Crossed fused renal ectopia
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Both kidneys are located on the right side of the midline and show fusion at their poles with renal sinuses directed away from each other.
The left renal fossa is empty. Features suggest a sigmoid type of Crossed fused renal ectopia.
Crossed fused renal ectopia is believed to be a result of abnormal development of the ureteric bud and metanephric blastema during the fourth to eighth weeks of intrauterine life. After Horseshoe kidney, it is the most frequent common abnormality of the urinary tract.
Actual incidence of this anomaly is not known as a large majority are asymptomatic. Estimated incidence at autopsy is 1:2000.
It may be associated with pyelonephritis, hydronephrosis due to pelviureteric junction obstruction, urolithiasis and vesicoureteral reflux.
- Solanki S, Bhatnagar V, Gupta AK, Kumar R.Crossed fused renal ectopia: Challenges in diagnosis and management.J Indian Assoc Pediatr Surg. 2013 Jan;18(1):7-10. doi: 10.4103/0971-9261.107006.