Herniated Umbilical This is caused by a weakness in the abdominal wall and failure of the umbilical ring to close properly and presents itself as a lump over the umbilical opening. It can sometimes (but not always) be caused by an oversized fetus.   Recommended treatment: None, unless it should change in appearance or show any signs of other abnormalities.  It can be surgically corrected, but this is usually not necessary. To link to this page: http://www.raisinrats.com/medical/herniated.html [back to top]