Omphalomesenteric duct cyst
Encyclopedia
Omphalomesenteric duct cysts (ODC, also known as an omphalomesenteric duct remnant or vitelline cyst) are developmental defects relating to the closure of the omphalomesenteric duct. It usually disintegrates within six weeks of gestation, but remnants of the cyst can sometimes be found along the intestines or umbilicus
Navel
The navel is a scar on the abdomen caused when the umbilical cord is removed from a newborn baby...

. Any remnants can be removed via surgical means.
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