A rare congenital condition where a person has duplicated or partially formed internal organs, particularly affecting the duodenum or other digestive structures.
From Greek ana- (up, back) + didymus (twin), literally 'doubling.' This medical term emerged in the 1800s to describe unusual embryonic developments that create duplicate organ-like structures.
Sometimes during fetal development, things get crossed wires and the body tries to make a spare set of organs—resulting in a truly bizarre situation that doctors need special names for. This word is basically nature's way of saying 'oops, made it twice!'
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