It is hard to predict how long someone with mosaic trisomy 9 will live. Infants with trisomy 9 in most of their cells may be very sick and may die in early childhood; however, individuals with less cells that have the extra 9th chromosome may have fewer health issues and should live longer. Rarely, individuals with a very small amount of extra chromosome 9 cells found on prenatal testing may have very few to no medical issues and live much longer. There are reports in the literature of adults with mosaic trisomy 9 living up to 44 years. It can be difficult to predict severity in mosaic trisomy 9 since we don’t know which cells in the body have the correct number of chromosome and which cells have the extra copy of the 9th chromosome.
When mosaic trisomy 9 is found before a baby is born, through amniocentesis or chorionic villus sampling, it can be very difficult to predict what health problems will occur. If the test finding mosaic trisomy 9 is a chorionic villus sampling, then there is a chance that all the trisomy 9 cells are only in the placenta and not in the baby (confined placenta mosaicism). The risk for confined placental mosaicism is approximately 1%. In this case, an amniocentesis may be suggested to look at the baby’s cells directly. Medical geneticists and genetic counselors can be very helpful in discussing the possible outcomes based on this information.
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