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Congenital fistulæ, such as occur in the neck from imperfect closure of branchial clefts, or in the abdomen from unobliterated fœtal ducts such as the urachus or Meckel's diverticulum, will be described in their proper places.
Simmons reports a case in which a calculus passed through a fistulous sore in the loins without any concomitant passage of urine through the same passage. Vosberg mentions a calculus in a patent urachus; and calculi have occasionally been known to pass from the umbilicus.
There is a case described of a man who evidently suffered from a patent urachus, as the urine passed in jets as if controlled by a sphincter from his umbilicus. Littre mentions a patent urachus in a boy of eighteen. Congenital dilatation of the ureters is occasionally seen in the new-born. Shattuck describes a male fetus showing reptilian characters in the sexual ducts.
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