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Prenatal diagnosis of cystic fibrosis: ultrasonographic appearance of meconium ileus in the fetus.

Four of ten fetuses carrying a risk of 1:4 for cystic fibrosis were found to have low levels of microvillar enzymes in the amniotic fluid obtained between 17 and 18 weeks' gestational age. On sonography performed prior to the amniocentesis, three fetuses showed enlarged bowel loops. At autopsy, meconium ileus was detected. Enlarged bowel loops are a sign which has not been described previously so early in pregnancies.