30. Remnants of Umblicus
[Urachal Remnants]: These occur when the urachus—a tube that channels urine from the fetus to the allantois—fails to close and turn into a ligament. They can manifest as a [patent urachus], [urachal cyst], or [sinus]. [Omphalomesenteric Duct Remnants]: These are remnants of the connection between the yolk sac and the gut, which can appear as polyps or fistula .[Umbilical Granuloma]: A small piece of red tissue that remains at the belly button after the umbilical cord separates