D2I2.
congenital

Meckel's diverticulum

A Meckel's diverticulum, a true diverticulum, is a slight bulge in the small present at birth and a vestigial remnant of the vitelline duct. It is the most common of the tract and is present in approximately 2% of the population, with males more frequently experiencing symptoms.

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Plain-language summary adapted from Wikipedia. Not medical advice.