chromosomal anomalies -- any problem in a person's genetic code, or DNA. Very minor anomalies may not even be noticeable. More serious ones cause problems such as Down's Syndrome and other known genetic disorders.
Chromosomal anomalies are responsible for about 60 percent of early miscarriages and are less frequently the cause of stillbirth.
Rinehart BK, Terrone DA, Taylor CW, et al. 2000. Single umbilical artery is associated with an increased incidence of structural and chromosomal anomalies and growth restriction. Am J Perinatol 17(5): 229-32 ...
7 In addition, infants with congenital and chromosomal anomalies, discordant twin sets (>20% discordance in weight) and those with severe growth restriction were excluded because they represent a subset of patients with increased morbidity.
 See also: Pregnancy, Oxygen, Pregnant, Placenta, Pregnant woman
  
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