The frequency of aganglionosis associated with imperforate anus.
D001006:Anus, Imperforate / Q000150:complications*; D004314:Down Syndrome / Q000150:complications*; D005725:Ganglia, Autonomic / Q000002:abnormalities*; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008531:Megacolon / Q000150:complications*