Thursday 17 June 2010
The umbilical polyp presents as a bright red polyp or fleshy nodule, 0.5–2 cm in diameter; it may discharge a mucoid secretion.
A distinctive umbilical polyp, devoid of any epithelial component is termed a fibrous umbilical polyp.
Umbilical polyps (omphalomesenteric duct polyps) are covered by epithelium which is usually of small bowel or colonic type, but occasionally of gastric type. Ectopic pancreatic tissue has also been described.
There is usually an abrupt transition from epidermis to the intestinal or gastric type of epithelium.
Urachal remnants are lined by transitional epithelium; sometimes smooth muscle bundles are present in their wall. There may be a mild inflammatory cell infiltrate both in umbilical polyps and in urachal remnants.
- digestive development
omphalomesenteric duct remnant