D2I2.
congenital

Annular pancreas

Annular is a rare condition in which the second part of the duodenum is surrounded by a ring of continuous with the head of the pancreas. This portion of the pancreas can constrict the duodenum and block or impair the flow of food to the rest of the intestines. It is estimated to occur in 1 out of 12,000 to 15,000 newborns. The ambiguity arises from the fact that not all cases are .

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