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A urachal fistula is a congenital disorder caused by the persistence of the allantois , the structure that connects an embryo's bladder to the yolk sac. Normally, the urachus closes off to become the median umbilical ligament; however, if it remains open, urine can drain from the bladder to an opening by the umbilicus.
This condition is a rare defect, mostly found in children, and is also known as an open or patent urachus.
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