Authors' Note: Horseshoe kidney is a relatively common congenital malformation, occurring in 1/500 individuals. Also known as renal fusion, it results from the merging of two fetal kidneys in the pelvis during the stage of embryonic organ development and consequently failing to undertake their normal upward migration. Fortunately, health consequences are usually mild, if any; occasionally, one of the ureters becomes obstructed. The abnormal structure is often discovered incidentally during procedures, e.g. CT scanning or ultrasound, targeted at pelvic discomfort or unrelated symptoms (and of course, no normal kidneys are seen in their usual position).
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