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A Meckel's diverticulum is a congenital sac-like protrusion of part of the wall of the small intestine, some of which contains stomach mucosa.
In this case, stomach acid secreted from the stomach lining in that area can cause ulcers and bleeding.
It can also cause inflammation and perforation (the formation of a hole).

It may be detected by ultrasound or CT scan, and will also show up as spots on a Meckel scintigraphy (gastric mucosa scan).
If a Meckel's diverticulum is causing bleeding or inflammation, it will need to be surgically removed. The surgery is usually performed through the belly button, leaving no visible scar.
