The urachus is the fibrous vestigial remnant of the fetal allantois.
The lumen of the urachus usually obliterates after birth and it becomes the median umbilical ligament, a midline linear fibrous fold of parietal peritoneum, extending from the apex of the bladder to the umbilicus.
If the lumen does not completely involute, a spectrum of urachal remnants may persist, including:
A urachal remnant may develop adenocarcinoma.
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