Background: The most common chromosomal abnormalities are aneuploidies of chromosome 21, 18, 13, X and Y. Prenatal diagnosis of fetal aneuploidies is routinely done by traditional cytogenetic ...

Other chromosomal abnormalities such as T18 and other fetal congenital malformations may also be detected. T18 is found in only 1:8000 newborns because 95% of these trisomic fetuses abort ...