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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this number varies widely. [3] At the same time, they enjoy a rich social and emotional awareness. [4] Down syndrome is the most common chromosome abnormality in humans, [3] occurring in about one per 1000 babies born each ...
"Differential diagnosis" is also used more loosely to refer simply to a list of the most common causes of a given symptom, to a list of disorders similar to a given disorder, or to such lists when they are annotated with advice on how to narrow the list down (French's Index of Differential Diagnosis is an example). Thus, a differential ...
Mosaic Down syndrome: Only some cells in the person have an extra copy of chromosome 21. This genetic cause is considered rare. This genetic cause is considered rare.
Physical abuse of adult (coded V61.1 in the DSM-IV) V61.12 if by partner (included only in the DSM-IV-TR) V62.83 if by person other than partner (included only in the DSM-IV-TR) ___.__ Sexual abuse of adult (coded V61.1 in the DSM-IV) V61.12 if by partner (included only in the DSM-IV-TR) V62.83 if by person other than partner (included only in ...
Adie syndrome; Adiposogenital dystrophy; Adult-onset immunodeficiency syndrome; Advanced sleep phase disorder; Aerotoxic syndrome; Afferent loop syndrome; Aicardi syndrome; Aicardi–Goutières syndrome; AIDS dysmorphic syndrome; Al-Raqad syndrome; Alagille syndrome; Albinism–deafness syndrome; Alcohol withdrawal syndrome; Alezzandrini ...
An anaphase lag of a chromosome 21 in a Down syndrome embryo leads to a fraction of euploid cells (2n cells), phenomenon described as "aneuploidy rescue". There is considerable variability in the fraction of cells with trisomy 21, both as a whole and tissue-by-tissue. This is the cause of 1–2% of the observed Down syndromes. [4]
For Ashley Zambelli, a surprise diagnosis allowed her to have an even more special bond with her children.. The Michigan-based mom, 23, recently found out she has Mosaic Down syndrome, a condition ...