Were you looking for information about Down Syndrome? Trisomie 21 is a term that may be used when looking for information on Down syndrome.
Down syndrome is a disorder caused by an additional chromosome 21, also known as trisomy 21. The condition is usually the result of a random event that occurs during the formation of reproductive cells (eggs and sperm). There are several established risk factors for this disorder, including having a baby previously with Down syndrome, increasing maternal age, and carriers of a balanced translocation. Down syndrome is often associated with characteristic facial appearance, poor muscle tone, and mental retardation.
(Click Down Syndrome for more information on the causes of this condition, to find out how it is diagnosed, and for information on available treatment options. You can also click any of the links in the box to the right for specific information.)